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#30
by
92EcoDiesel Jetta
on 30 Oct, 2013 08:11
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I think it's incorrect to say there is no fuel pressure in the return lines. Just the restriction of the small diameter line pushing fuel back to the tank results in some pressure . My guess a few psi, enough to pop the daisy chain lines if not a tight fit on the barbs.
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#31
by
bajacalal
on 30 Oct, 2013 11:10
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I've always used what I think is 1/8" diameter fuel line for the injectors and without problems. It's not clear. I get it at NAPA but you could try like a lawnmower shop too.
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#32
by
fatmobile
on 30 Oct, 2013 11:17
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I think it's incorrect to say there is no fuel pressure in the return lines. Just the restriction of the small diameter line pushing fuel back to the tank results in some pressure . My guess a few psi, enough to pop the daisy chain lines if not a tight fit on the barbs.
Right, there is a small but measureable amount of pressure.
If it's blowing lines something is wrong.
MK2s have a check valve in the return line, that can restrict flow.
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#33
by
92EcoDiesel Jetta
on 01 Nov, 2013 09:22
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I think it's incorrect to say there is no fuel pressure in the return lines. Just the restriction of the small diameter line pushing fuel back to the tank results in some pressure . My guess a few psi, enough to pop the daisy chain lines if not a tight fit on the barbs.
Right, there is a small but measureable amount of pressure.
If it's blowing lines something is wrong.
MK2s have a check valve in the return line, that can restrict flow.
A clogged tank vent can also restrict return fuel flow and increase pressure. The OE braided return hose fits onto the injector barbs much tighter than the Tygon polyurethane tubings and less prone to blowing off. Hoses are layered/reinforced, tubings are not.
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#34
by
Mark(The Miser)UK
on 01 Nov, 2013 15:51
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What happened to those micro clips that used to hold the braided leak-offs-on?
Tyler why are you keeping your manometer reading-pressure-proof to yourself? 
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#35
by
TylerDurden
on 01 Nov, 2013 16:16
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#36
by
Mark(The Miser)UK
on 01 Nov, 2013 19:37
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Was that veg colouring or blood? On this forum it could easily be the latter
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#37
by
TylerDurden
on 01 Nov, 2013 20:11
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Nah... this crowd is a basket of kittens.
(The electric vehicle guys are another story.)
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#38
by
libbydiesel
on 02 Nov, 2013 08:36
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The c-210-a clear tygon hose is better than the stock braided hose in every way. It lasts much longer, is more resilient, much less prone to leaks, clear for easy diagnosis, rated for biodiesel, etc, etc... I've used it on more than 10 vehicles now for several years without issue. Those vehicles include Mercedes and VW diesels (each generation from mk1 to ALH). I have also used it for boost fittings without clamps where it has seen greater than 25 psi without any issues of leakage or popping off.
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#39
by
Mark(The Miser)UK
on 02 Nov, 2013 10:45
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Is there a 'best' tubing, for reuse purposes?
Periodic experimentation has me cutting the lines over-long to start with to get two or three reuses.
Clamps may have been the solution, but what the heck did I do with all mine 
Only the one's on the boost remain...
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#40
by
Mark(The Miser)UK
on 04 Nov, 2013 18:32
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#41
by
ORCoaster
on 04 Nov, 2013 20:49
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Let us know how well they do the job. I have gone to using very narrow zip ties. I tried some thin braided copper wire but it cut through the rubber hoses and I wasn't any better off for it.
I love the differences in our languages. dispatched in one day. That would mean they would be dead not mailed to you.
So if you end up with a bunch of flattened pieces of metal you will know why.
Dispatched by Ball Peen.
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#42
by
Mark(The Miser)UK
on 05 Nov, 2013 03:50
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#43
by
mtrans
on 05 Nov, 2013 11:40
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If you hate clips etc... like I do
like this 3 yr no problem,eazy conect-deconect
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#44
by
wolf_walker
on 05 Nov, 2013 17:25
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There is a VW part number for the clips to hold those bypass lines on. I have it, somewhere...
Never seemed to need any and have never seen them on a motor but they were in the EPC somewhere.
Never needed anything but the old braided hose either myself. I don't run alternate fuels and generally leave
em alone once I install em. They last as long as it takes an injector to need a nozzle or longer with fuel being what it is
these days in the US. Every time I see someone have something that isn't the braided cover line on there it ranks
right up there with a fram oil filter. Not that there aren't folks that have made informed decisions on an alternate line,
but it's the exception rather than the rule in my experience.
All that braided line isn't created equal either.
Wrong clips... I hate those, or at least in the larger sizes... I bought these: