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Engine Specific Info and Questions => IDI Engine => Topic started by: wahlet on November 07, 2007, 06:12:22 pm

Title: Replace leaking fuel lines on MK2 with viton?
Post by: wahlet on November 07, 2007, 06:12:22 pm

Will Biodiesel / SVO work in a MK2 in original rubber/plastic fuel lines?

And sub-question: has anyone done a fuel line swap on a MK2?  Got any hints?

Lately my Jetta's developed a habit of shuddering at road speed.  I've traced it to bubbles in the fuel line (to inj. pump).  I've deleted the water trap under car - it was broken anyway, and have replaced some hose clamps.  Also checked fuel pickup / sending unit in trunk.  Jetta runs better but not perfect.  Figure I might as well replace lines and do 2 things at once: remove bubbles, and make compatible with Biodiesel (if necessary).

Thoughts?

Title: bio
Post by: pariah on November 08, 2007, 09:14:31 am

i have heard viton is the shisnit but costs a bit... have been running B100 through polyurethane lines for about 4 months and they are just like the day i bought them... my rubber lines lasted about 3 weeks and started to sweat.... after 2 tanks of bio its a good idea to change your fuel filter... i have a mk1 all the lines were 5/16" (8mm) except from the filter to the pump that short one was 1/4" (6mm) and off of my tank there was a odd section that was 3/8" (10mm) to 5/16" (8mm) that i just made sure my hose clamp was positioned well that has worked with no problem using just a 3/8" (10mm) section then theres the tiny injector hoses.... it took me less than 30 min to change all the hoses definately worth it....

Title: Replace leaking fuel lines on MK2 with viton?
Post by: wahlet on November 08, 2007, 04:53:46 pm

Thanks pariah.  What other materials will work?  Viron, polyurethane?  Where's a good place to get this stuff?

Title: poly
Post by: pariah on November 10, 2007, 01:34:24 pm

i got mine here
 http://procycle.us/main/fuel_hose.htm
i have also heard that silicone and if you are ambitious stainless steel works
do not try vinyl... :)

Title: Replace leaking fuel lines on MK2 with viton?
Post by: burn_your_money on November 10, 2007, 02:15:51 pm

MK1s have steel lines, mk2s have plastic (under the car)

You'll be in for more then 30 minutes of work

Title: Re: poly
Post by: wahlet on November 10, 2007, 02:23:13 pm

Quote from: "pariah"

i got mine here
 http://procycle.us/main/fuel_hose.htm

Is that polyurethane hose rigid enough to handle the vacuum pressure?  Is it rigid enough to clip into the plastic clips under the car and keep from sagging in between?

If so, it sounds like a good option, and cheap!  I almost bought the viton kit from Greaseworks.org today for $100+.

Title: Replace leaking fuel lines on MK2 with viton?
Post by: bigblockchev on November 10, 2007, 09:42:09 pm

I have been running B100 for the past 2 years. The only issue that I have had is with the injector return lines. I got some viton from Mcmaster Carr and  replaced them and all has been good so far. I have not noticed any leaks or deterioration on the rest of the lines. Cheers Dan

Title: wow
Post by: pariah on November 11, 2007, 07:39:33 am

umm... good questions... the mk1 has metal lines that run the length of the car so there is only flexable lines like 1 ft on either side .... they are fine on the vaccum

Title: Replace leaking fuel lines on MK2 with viton?
Post by: jtanguay on November 11, 2007, 11:42:44 am

what are good hoses for the cloth return lines?  mine keep leaking and its pissing me off... i'm not using biodiesel or anything either!  anyone have a good and possibly cheap solution that will withstand ulsd and bio?

thanks

Title: Replace leaking fuel lines on MK2 with viton?
Post by: MikeyT on November 12, 2007, 02:15:30 pm

I've used the polyethelene tubing and fittings (push-on) from Lowes plumbing section for over a year, they are cheap and are holding up fine, no vacuum or pressure leaks. 3/8 OD for the feed and 1/4 OD for the return, ran them in exactly the same position as the original lines. Gates brand fuel rated 1/8 rubber line in place of the expensive VW cloth covered line also works for me, you should be able to get this at any real auto parts store at around .50 per ft.

Title: lines
Post by: bigblockchev on November 12, 2007, 06:58:32 pm

JT that is what I used the viton for, the return lines. You only need a short section maybe 18" or so to do them all. Cheers Dan