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Engine Specific Info and Questions => IDI Engine => Topic started by: tunedbandit on March 29, 2010, 12:23:43 pm
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Hey guys
anyone running svo using a preheat 2 tank set up,was thinking of running my 2001 T4 1.9TD,,dont fancy mixing it want to do it right & heat the stuff up then flick a switch,,cheers Rick
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I've been running WVO in my 1.6 NA/s for years now.. SVO should even be easier, less clean up involved..... You're 1.9 is a direct injection engine isn't it?
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Super easy and great once running well.
#1 definitely heat the tank and VO fuel filter
#2 i strongly recommend a vegetherm heater from Plantdrive. Install it just before it goes in the pump.
#3 don't use any garbage for WVO. If it's cloudy,walk away, it has water in it. The better you filter it before it goes in your tank the better it'll run.
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Best advice--go here + read read read.
www.greasecar.com (http://www.greasecar.com) /community/ forums
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anyone running svo
Its great if you want to trash a good engine.
dont fancy mixing it want to do it right
Then buy a biodiesel processor. There is no way to run an engine on raw VO without long-term damage.
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Not that i'm completely doing for how much less it cost's, But when considered, the amount saved will easily pay for worn pumps and engines. I now have 2 old customers who have been running on WVO for about 100,000 kms each in work trucks- Ford f 350s, without any issues, other than filter changes. Louie has saved about $30,000 in the past 2 years
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But when considered, the amount saved will easily pay for worn pumps and engines.
Ah, you're going for the "cheapskate" argument instead of how "green" it is, makes sense since trashing pumps and engines isn't very environmentally friendly.
Louie has saved about $30,000 in the past 2 years
EPA's fines can make that pale in comparison when they dip your tank.
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But when considered, the amount saved will easily pay for worn pumps and engines.
Ah, you're going for the "cheapskate" argument instead of how "green" it is, makes sense since trashing pumps and engines isn't very environmentally friendly.
Louie has saved about $30,000 in the past 2 years
EPA's fines can make that pale in comparison when they dip your tank.
So are you calling yourself a greeny/treehugger then?
And are you claiming it's illegal to run vegi oil?
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So are you calling yourself a greeny/treehugger then?
Thats impossible for anyone to genuinely claim.
And are you claiming it's illegal to run vegi oil?
There is no claim. Its a fact VO is illegal to use in any on-highway engine.
If you want to gum up your race engine, farm truck or bobcat with it, have a ball!
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Scrap metal from a junk engine or pump is pretty small in the grand scheme of things, and I am not sold on the WVO damages engines thing, mine looks normal for its age every time I have it apart. Chances are an old pump is about to fail from ULSD anyway.
Yes any fuel on which you do not pay road tax is illegal. Used VO is hazardous waste, and requires a permit to carry. What percent of fuel additive you are allowed to run is a huge grey area.
As far as my own WVO setup, I think 20 year old diesel components have given me more trouble than the grease side of things.
To back up an earlier post, initial quality of the oil is everything. The only Veg Therm I ever looked at was leaking, and I binned it. Heat seems to work. All the kits I've seen gome with inferior hardware, I typicaly spend about $100 at the hydraulic shop to rectify that.
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I've been running WVO in my 1.6 NA/s for years now.. SVO should even be easier, less clean up involved..... You're 1.9 is a direct injection engine isn't it?
hi mate no its indirect injection "1.9TD"
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thanks for the advice chaps,
diesel at the pump hear in the UK is nion £1.20 per litre & is deffo going to rise :'(
brand new off the shelf veg oil from Tesco is 75p per litre
here in the UK you can run "Before declaring it less than 2500 litres per year
Fuel Duty. (UK).
Revenue & Customs biofuels simplification - Change in the way UK vegetable oil fuel duty is collected was passed in Parliament on 8th June 2007 and me into effect on 30th June 2007.
Earlier this year Revenue & Customs proposed:
A de minimis production level of 2,500 litres per annum below which producers would not need to enter premises, submit returns or pay duty (Please note: we seem to have many customers who are getting confused by Revenue & Customs use of the word "producers", we have checked and it has been confirmed that USERS and PRODUCERS can be treated, for these purposes as THE SAME), and
Reducing the frequency of returns for all but the largest producers (defined as those producing over 450,000 litres per annum) from monthly to quarterly.
Revised 12/06/07: For further info from Revenue & Customs website see the following publications:
11/06/07 Follow up to Revenue & Customs Brief 37/07 on Biofuels Simplification
08/06/07 Explanatory Memorandum Amendment
Revenue & Customs Brief 37/07 - Introduction of biofuels simplification
Biofuels and other fuel substitutes
Below are the previous proposal publications that set the background to the new rules
Summary of Responses: Review of the definition of biodiesel
Biofuels: simplification of regulations
This is fantastic news for all biofuel users or potential users, UK Revenue & Customs will introduce new rulings on the way fuel duty is handled, in effect providing you use less than 2,500 litres per annum you will not have to register or pay duty.
Whats more Diesel is over £1.00 per litre, new veg from supermarkets, cash and carry such as Costco and Macro in 20 Litre drums, or in larger quantities from wholesale suppliers and canneries such as KTC Edible Oils in larger quantities (1000 litre IBC). Oil is around 50 to 60p per litre so its half price motoring on new oil lowering to next to nothing if you reclaim and use waste oil.
To see what this will mean have a look at the table below, compare your average mpg to see how many miles or kilometres you can travel on veg oil without having to worry about fuel duty - that's right TAX FREE!! Perfectly legal.
Maximum allowable veg oil usage in Litres before having to register or pay fuel duty to UK Revenue & Customs is set at 2500 Litres Per Year, below you can see how many miles or kilometres this equates to when compared to your vehicles Miles Per Gallon
Average Miles Per Gallon
20 25 30 35 40 45 50 55 60
Miles you can run on veg oil before you have to register or pay duty:
10,998 13,748 16,498 19,247 21,997 24,747 27,496 30,246 32,995
Kilometres you can run on veg oil before you have to register or pay duty: 17,700 22,125 26,550 30,976 35,401 39,826 44,251 48,676 53,101
all the above info is taken from
www.dieselveg.com (http://www.dieselveg.com)
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IDI's seem to be much more forgiving when it comes to burning things other than diesel in them.. Get all the proper heating in order and you should be set.. Sounds like your government had their act together when it comes to burning this on the road..
Over here, most states have nothing against burning VO other than they want the taxes.. However many states do not recognize it as a alternative fuel.. This would equate to a higher road tax.. But to make things more interesting, on the federal level it's not approved as a road fuel, period.. Since there is really nothing set up to enforce such laws (excluding people who have nothing better to do or are mad because they didn't think of it) it really isn't much of a concern..
I had approximately 180,00 miles (290,000km) on my one car burning WVO.. My current car is at around 130,000 miles (210,000KM) on WVO.. The only real issue I have had is getting everything hot enough in the winter months.. When the ambient temps get and stay at or below freezing I end up running diesel all the time.. I have debated either making a smaller tank or using a larger heat exchanger. I suspect the issue is the engine just doesn't generate enough waste heat as even the coolant temp remains low unless I turn off the coolant flow to the WVO system.. I ran out of WVO a month before winter set in, and new fuel grade VO isn't really much of a savings over here, so I haven't devoted much time to fixing this yet.. Possibly some sort of electric heater (such as the suggested Vegtherm) may be the answer.. I'm sure it would help in being able to switch from diesel faster.. Now that the weather is warming up and my seasonal WVO sources are back in operation I plan to get back to work on it.
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There is no way to run an engine on raw VO without long-term damage.
You'd better get in touch with Elsbett and tell them what they've been doing for years doesn't work then.
Do you know exactly what type of damage results, even with clean svo and a properly operated 2 tank & heater system? I would be interested to hear any solid facts you have about this...
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Considering Rudolf Diesel designed the engine to run off peanut oil, it seems funny that people are so resistant to using veggy fuels.
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Considering Rudolf Diesel designed the engine to run off peanut oil, it seems funny that people are so resistant to using veggy fuels.
couldn't agree more mate i just wanted to know if anyone on here as done/fitted there own kit & pics/info on how they did it,,Ive know doubt it will run Ive run nion svo without a heater system fitted & it run fine bar summer morning start up splutters,,& it smelt of burning veg oil eg in the cab,,so iam thinking due to the fact the oil wasn't warmed up is the reason for the smell & spluttered start up"s
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More then likely, VO needs to be fairly thin to be able to run through the injectors.
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iam looking into building my own alloy veg tank to fit in the back of the t4 with copper coiled piping running from the heater system to heat the oil up,,then some sort of heat exchange under the bonnet area
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yea the only worry I'd have with all the different metals used is the polymerisation of the oil.
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Scrap metal from a junk engine or pump is pretty small in the grand scheme of things
Not really. The smelting and energy to make the metal of an engine is more than the exhaust of a few cars per year.
Chances are an old pump is about to fail from ULSD anyway.
That is false. ULSD has zero issues.
Yes any fuel on which you do not pay road tax is illegal.
Tax is a very minor issue; the entire process of "converting" a vehicle is illegal. There are no EPA or DOT approved conversions on the market and raw vegetable oil is not approved by the EPA as a fuel either. By nature, it can't get approved. The base oil, quality and contaminants varies greatly from batch to batch let alone between sources. Because of that variance and the individual nature of its preparation there is no way to standardize and legalize it.
Thats why Biodiesel was developed. It allows for a consistent end product, no alteration of the vehicle's fuel system, no significant change in emissions output and no risk of damage to the engine if used in the percentage allowed by the OEM.
You'd better get in touch with Elsbett and tell them what they've been doing for years doesn't work then.
There is no such thing as a good single tank system. Elsbett makes crap on par with Lovecraft for the simple fact its a single tank system.
Do you know exactly what type of damage results
Engine oil contamination, accelerated carbon buildup in the combustion chamber and piston rings, excessive wear of the injection pump elements, high exhaust emissions and hacking of the vehicle body to fit the conversion.
Considering Rudolf Diesel designed the engine to run off peanut oil, it seems funny that people are so resistant to using veggy fuels.
Considering he died 20 years before the first diesel car was ever made and 50 years before your engine was designed by VW, its funny that people continue to make such an irrational association between a man and an engine he had absolutely no involvement with.
Also, you need to get your facts straight. Diesel engines were designed to run off coal dust. The only reason peanut oil was chosen is coal dust proved to be impractical for common use.
So please let us know when you've finished your coal dust conversion, after all thats what Dr. Diesel designed your engine to run on! :)
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Scrap metal from a junk engine or pump is pretty small in the grand scheme of things
Not really. The smelting and energy to make the metal of an engine is more than the exhaust of a few cars per year.
Most of us go with rebuilt over new.
Chances are an old pump is about to fail from ULSD anyway.
That is false. ULSD has zero issues.
ULSD pulls the aromatics from the pump seals if the pump had been previously used with non ULSD. The oil companies admit this, and consider it acceptable losses, since they were exempted from responsibility.
Yes any fuel on which you do not pay road tax is illegal.
Tax is a very minor issue; the entire process of "converting" a vehicle is illegal. There are no EPA or DOT approved conversions on the market and raw vegetable oil is not approved by the EPA as a fuel either. By nature, it can't get approved. The base oil, quality and contaminants varies greatly from batch to batch let alone between sources. Because of that variance and the individual nature of its preparation there is no way to standardize and legalize it.
The only vehicle requirement i've found is a DOT standard which says your tank must not leak much after a 20' edge on drop to concrete. Not much of a worry with my alloy marine tank. neither the EPA nor the DOT are in the business of certifying fuel tanks, lines or heat exchangers, and Highway Patrolmen are not qualified to test them for standards compliance. Tax is a major issue, often you go away longer for stealing from the government than for killing a man.
Thats why Biodiesel was developed. It allows for a consistent end product, no alteration of the vehicle's fuel system, no significant change in emissions output and no risk of damage to the engine if used in the percentage allowed by the OEM.
IMO Biodiesel was invented so lazy people could just shove a nozzle in their tank. It can be consistent, but often is not.
You'd better get in touch with Elsbett and tell them what they've been doing for years doesn't work then.
There is no such thing as a good single tank system. Elsbett makes crap on par with Lovecraft for the simple fact its a single tank system.
Agreed single tank is 100% crap
Do you know exactly what type of damage results
Engine oil contamination, accelerated carbon buildup in the combustion chamber and piston rings, excessive wear of the injection pump elements, high exhaust emissions and hacking of the vehicle body to fit the conversion.
If you don't stay on top of oil changes, polymerization will destroy your oil and engine. Neither of my Veg motors showed anything unusual in the chambers. i've yet to see anything conclusive on emissions, mine are pretty high either way. i've seen dymo smoke tests go either way.
Considering Rudolf Diesel designed the engine to run off peanut oil, it seems funny that people are so resistant to using veggy fuels.
Considering he died 20 years before the first diesel car was ever made and 50 years before your engine was designed by VW, its funny that people continue to make such an irrational association between a man and an engine he had absolutely no involvement with.
Also, you need to get your facts straight. Diesel engines were designed to run off coal dust. The only reason peanut oil was chosen is coal dust proved to be impractical for common use.
So please let us know when you've finished your coal dust conversion, after all thats what Dr. Diesel designed your engine to run on! :)
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I will only ad a couple of things and then bail because i'm sick of arguing about this.
In Quebec it is NOT illegal to run on VO . I( asked before i started my company] . They only care about taxes. A couple of the trucks i did went through inspections and they didn't care.
Here the only tax issue is if you buy the WVO from some one . Then you are supposed to submit a fuel tax form.
Elsbett produces work fine in Europe where it doesn't get quite as cold here for any length of time.
I HAVE NEVER HAD A COME BACK OR ISSUE WITH ANY OF THE CONVERSIONS I DID. MANY HAVE LOTS OF KMS UNDER THEIR BELT. NOT ONE FAILURE OR RUNNING ISSUES - except when the WVO was poor.
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yea the only worry I'd have with all the different metals used is the polymerisation of the oil.
Indeed.. Galvanized steel and copper are two that can do some funky things with the oil.. VO isn't so bad, but when you get into WVO it's much worse with the slight acidity of it..
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ULSD has zero issues.
The issues of ulsd are known, so zero issues is quite far off the mark. Even Giles has comments about this on his website.
There is no such thing as a good single tank system. Elsbett makes crap on par with Lovecraft for the simple fact its a single tank system.
I didnt mention single tank systems, neither did the OP, not sure what you're talking about there. I was simply pointing out you were very wrong when you said "There is no way to run an engine on raw VO without long-term damage." Clearly this isn't the case. See also the post here where somebody has clocked up 6 figure milage numbers on veg oil.
Engine oil contamination, accelerated carbon buildup in the combustion chamber and piston rings, excessive wear of the injection pump elements, high exhaust emissions and hacking of the vehicle body to fit the conversion.
Engine oil contamination, thats a good one, so you have zero blow by running on diesel? I would like to see the evidence on accelerated carbon buildup etc, i think you're just making it all up as per usual. You have read this somewhere and quote it as fact, without really having a clue either way.
High exhaust emissions = damage to vehicle? Ok, if you say so.
I wont mention that veg oil is almost carbon neutral, so emissions isnt a major issue anyway. Oops, i mentioned it.
And classing 'hacking of the vehicle body' as damage as a result of veg oil conversion really is clutching at straws. You're on a forum full of people modifying their vehicles, so clearly nobody here see's hacking their vehicle an issue.
The whole coal dust argument doesn really cut it, Rudolph Diesel saw both coal and peanut oil (or similar) as potential fuel sources, so coal or no coal, it is STILL unusual that people are so against using veg oil as a fuel in a diesel engine.
Peace,
MM :P
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When someone tells so many lies and falsehoods and presents them as fact without any data to back it up, it makes it impossible to accept anything they say in the future as even remotely accurate.
MonkeyMagic pretty much said what I was thinking. On the accuracy of diesel pumps, injectors and wear associated with ULSD there isnt any one I would believe over Giles.
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When someone tells so many lies and falsehoods and presents them as fact without any data to back it up, it makes it impossible to accept anything they say in the future as even remotely accurate.
MonkeyMagic pretty much said what I was thinking. On the accuracy of diesel pumps, injectors and wear associated with ULSD there isnt any one I would believe over Giles.
Truth.
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Hi,
My references can be researched/accessed from www.journeytoforever.org (http://www.journeytoforever.org). If they do not have the answer they have links and REFERENCES to books, journals, articles, peer reviewed articles, experiments, etc.
I am not sure about the copper tube heating coil inside the VO tank. I have stainless steel in my head from a post somewhere, but cannot tell you why at the moment. Please read/search this site for the proper tubing. SVO/WVO will work in a two tank system as long as the engine is started/stopped on diesel and the VO is heated properly for flow. For VO to reach the same BTU's as diesel it has to be heated to ~400degF. Since the engine is running 180-200degF there will be some difference in energy output/performance of the engine. Not really enough to notice or care.
My comments regarding the undocumented/unreferenced posts are preceded by a ***
Quote from: OM617 on March 30, 2010, 01:13:44 PM
ULSD has zero issues.
The issues of ulsd are known, so zero issues is quite far off the mark. Even Giles has comments about this on his website.
***Many believe that sulphur is the lubricant, however it is not. ULSD has had the lubricity removed during the sulphur removal process. www.journeytoforever.org (http://www.journeytoforever.org)
Quote from: OM617 on March 30, 2010, 01:13:44 PM
There is no such thing as a good single tank system. Elsbett makes crap on par with Lovecraft for the simple fact its a single tank system.
I didnt mention single tank systems, neither did the OP, not sure what you're talking about there. I was simply pointing out you were very wrong when you said "There is no way to run an engine on raw VO without long-term damage." Clearly this isn't the case. See also the post here where somebody has clocked up 6 figure milage numbers on veg oil.
***WVO/SVO has different qualities. For example, rape seed oil (canola) has the best lubricity along with peanut oil. There are others with less lubricity, but all have a better lubricity content than ULSD. The lubricity of these oils creates less friction and wear than processed diesel. www.journeytoforever.org (http://www.journeytoforever.org)
Quote from: OM617 on March 30, 2010, 01:13:44 PM
Engine oil contamination, accelerated carbon buildup in the combustion chamber and piston rings, excessive wear of the injection pump elements, high exhaust emissions and hacking of the vehicle body to fit the conversion.
Engine oil contamination, thats a good one, so you have zero blow by running on diesel? I would like to see the evidence on accelerated carbon buildup etc, i think you're just making it all up as per usual. You have read this somewhere and quote it as fact, without really having a clue either way.
I wont mention that veg oil is almost carbon neutral, so emissions isnt a major issue anyway. Oops, i mentioned it.
***Engine oil contamination is present in every engine albeit in different levels.
***Accelerated carbon buildup has been discussed with motors that have EGR's. i.e. TDI
***Injection pump componants last longer using VO as long as the seals are biodiesel/ULSD friendly
***High exhaust emissions is vague and misleading. Vehicles produce COx whether on petrol or diesel. On VO the emissions change to NOx.
www.journeytoforever.org (http://www.journeytoforever.org)
Peace,
Michele
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I'll stick to the technical side of this argument, as I have not the patience to bicker over legalties or undocumented assertions, both of which vary greatly from one person/locality to the next. 8)
The concern over copper/Galvanised is absolutely valid. From my own research, neither has any place in a VO system. At issue is the fact that even dinodiesel is subject to longer chain polymerisation (waxes), and VO more so, WVO (sometimes) much more so. Of course WVO is hugely more variable than SVO, but the prudent thing to do would be to design for the worst case, right?
Certain compounds make good catalysts. Among these are most of the noble metals (Platinum, Palladium, etc), Copper, Zinc, Aluminum compounds, and sometimes even Iron. In making biodiesel it is the Sodium or Pottasium which acts as a catalyst to for the esters which are burned as fuel, by splitting off the glycerols. (Not a perfectly complete description, but you get the idea.)
So, when a system is built to heat and circulate VO/WVO, it is wise to avoid any materials which may act as a catalyst to further speed polymerisation. The heat in itself already contributes, so one thing I've always considered is limiting the temperature of the fuel which is returned to the tank, and not heating the tank beyond that neccessary to provide for good flowing fuel. That is, if you can pump from the tank to the front of the car at 40 degrees, you would want to add the rest of your needed heat as close to the pump as possible, and then preferably remove some or most of the heat before the fuel reached the tank again.
These are just my thoughts, YMMV.
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Copper grows green in veg, I avoid it.
My aluminum tank was disassembled after a few years in operation, and it was still cleaner than any fryer I have seen in service in a restaurant. I was quite surprised, and put it back together.
I found a small power increase on veg, and attribute it to the timing curve running closer to spec with a thicker fuel.
On cars that will start on cold veg, you can hear the pump metering reacts too slowly, and idle surging results.
Not sure I consider journeytoforever an unbiased source.
From my observation, 90% of problems with veg systems stem directly from incompetent mechanics doing design, install, and service. Much of this stuff is done by people with no idea you cant have a rubber coolant hose hanging down be the lowest point of your car, and may have never done an oil change.
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This is getting good. The info here is almost a reference point. I've read a lot of journey to forever info. But a lot you miss because it is so much reading. I'm glad to see we have people here who are doing this and I can hopefully call upon to help when I get started doing biodiesel and a WVO/VO conversion.
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I just turned 70k miles on veggie yesterday! ;D
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plaggy tank & plaggy pipe it is then :)
cheers for all the good input
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please define plaggy so I can use it in proper context ;D
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please define plaggy so I can use it in proper context ;D
Hes a Limey..so that might be an actual word there..but Im guessing its a case of "predictive" texting.
*Limey is as derogatory as being called a Yankee...and I love limes..hate scurvy..and love my island dwelling vw diseased brothers*
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lol ;)
yeah me been lazy
its a plastic tank mate
something similar to what these guys supply
www.dieselveg.com (http://www.dieselveg.com)
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Mr Bandit,
I have one of those exact tanks, unused, if you want one. Are you near York at all? If so Im there on Monday...
Cheers, MM
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ive got my eye on one at the mo :)
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Plastic seems to be the best bet.. Just make sure that if you use something that wasn't necessarily intended for this purpose that it can take the heat. First time out I used a 15 gallon plastic drum turned on it's side.. Although never a major problem, when it got up to temp it would get soft and slide about in it's mounting straps.. I probably never would have had to change it, but the thought of 10 or so gallons of hot WVO flowing from behind the back seat always worried me a bit..
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true,,,what a mess that would be :o
dont think you"ve every get rid of it :'(
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I actually imported some of those tanks from dieselveg. The nicest, thickest plastic tanks i've seen yet.
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Most of the plastic tanks I've encountered lack proper baffling and venting. Lack of baffles is really noticeable with a 30 gal tank half full transverse mounted in a Mercedes.
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Lack of baffles is really noticeable
Indeed!!! It's the one thing I have neglected on all 3 tanks I've made now Even with the 8 gallon tank in the spare tire well I can feel it slosh.. THe 15 gallon drum was horrid.. Had I not coated the inside of the tank in both cars with the Eastwood gas tank sealer (essentially plastic coats the inside of the tank) I'd be temped to break them open and weld something in there..
Speaking of venting, some more food for though.. I guess if you have something with a normal ole trunk this isn't an issue, however since all I ever seem to run is MK1 Rabbits the tank is basically in the passenger compartment.. Eventually I got sick of the smell inside the car (always arriving at places smelling like fast food grows old).. The latest rig I installed an external filler neck behind the license plate, and vented the tank though the cap.. No moer worries about spilling inside the car at fillup! Took care of the smell but now with all the heating and cooling I tend to draw a lot of moisture into the tank.. Especially in the lovely damp spring weather.. For now I went back to running a sealed cap and venting back inside the car.. I fashoined a foam filter like thing for the vent hose and chukked it into the quarter panel..
For those of you who are cheap like me and end up building a tank that costs 3x as much as one you could have bought, I've been looking at this PVC tubing that they use for heated driveways and radiant floor heating.. It must be able to transfer a reasonable amount of heat since in it's normal applications that's what it does.. I think it's rated for something like 300 psi @ 300 F... Might work nice for the in tank heat exchanger...
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It is definitely worth however much effort it takes to make filling happen outside the car.
PEX tube? it should do fine, just be sure no part of it is exposed to UV.
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It's wonderful to be able to back into the pump, flip the plate down, and grease 'er up.. I just snagged a fill nozzle from a fuel pump for my pumping station so it'll shut off before overflowing things.. 8)
Venting externally, however, wasn't as much fun of an experience.. I spend the better part of a month trying to find the source of the water... The current setup seems to be working okay now.. The car still has a bit of that smell going on, but nothing a pine tree can't fix.. And not near as bad a basically having a hole at the top of the tank..
This tubing I spoke of reminds me a lot of PEX but it has thinner walls.. It feels really flimsy, but according to the specs it should hold.. I'm assuming the pressure and temp specs are for just the tubing, and not for the tubing encased in say concrete.. I'll have to look into what they call it next time I'm buying house crap..
I have PEX wrapped with insulation stuff for the coolant lines back to the tank, and for the fuel lines too... Works spectacular... One just has to remember, when using PEX for coolant lines, to use the inserts inside the ends of the tubing with compression fittings.. Ask me what not to do, I've probably done it.. ::)
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PEX comes in two styles, one that is rigid, and one that is flexible.
the rigid stuff acts alot like PVC, but is a great inert plastic, and the flexible stuff has much thinner walls(while being made of the same inert plastic) and can be bent pretty easily around some pretty tight corners.
I like both, much easier to use than any other tubing system, it can all be assembled without heat or chemicals, and can even be disassembled later if you use the right couplers.
I would not hesitate to use it in a veg fuel system(if I built one, which I have no plans to do so)
I do have plans to use some for the plumbing of an air water intercooler in the fall.
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AS a rough guestimate this stuff I was looking at the walls were about half as thick as the flexible pex, although it didn;t feel quite as flexible.. It was made by Etna (?) plastics...