Well after about six months of burning B-100, my rubber fuel lines (as predicted) are weeping copious amounts of bio-diesel. I'd like to replace them with synthetic. Anyone ever changed all their fuel lines before? Any advice or instructions would be greatly appreciated.
Just in case anybody is wondering my truck is otherwise running very nicely on 100% bio-diesel which I purchase at the pump of a local gas station. I drive up, fill up, pay up, and drive away with a much cleaner burning fuel that is American grown.:cool2:
It would be nice if some day we could actually produce B100 without using foreign oil to do it. A lot of petroleum is used to produce, refine, and truck the crops and oils to make the B100.
I did a bit of testing and research on hose-life as did my son - who has access to better test equipment than I do. I assume you are referring to the return fuel lines that are approx. 1/8" or 3.5 mm i.d. unstretched. Good German-made hose is available in cut lengths from Volkswagen and Audi. Also the Italian diesel parts company Spaco.
After the testing we've done on various types of hose with several types of B100 and WVO, and high-heat over an extended period of time, we found the following.
Viton (hexafluoropropylene-vinylidene fluoride co-polymer) hose works the best and also costs the most. Buna-N rubber (Acrylonitrile Butadiene or nitrile rubber) is next best. Both versions I've gotten from McNaster-Carr hold up better than the OEM hose, made in China - that comes in the Dorman brand 6.2 diesel hose-kits. If you're going to be using a lot of fuels of questionable chemistry and acids, the Viton is by far the best choice.
The Viton hose is part #5119K41 at http://www.mcmaster.com/
It is $3.61 per foot.
The Buna-N hose with no sheaf is: 5235K42
43 cents per foot
The Buna-N hose with sheaf is: 5394K13
$1.40 per foot and is 9/64" i.d. insead of 1/8" but fits fine.
- High-Temperature Viton Rubber Tubing Soft, 1/8" ID, 1/4" OD, 1/16" Wall, Black ($3.61/foot)
- Oil-Resistant Black Buna-N Rubber Tubing 1/8" ID, 1/4" OD, 1/16" Wall Thickness ($0.43/foot)
The Viton tubing is a little more stretchy than the unsheathed Buna-N tubing, but both are as elastic (if not more so) than the original return line. The sheathed Buna-N tubing is much more rigid than any of the others.
- High-Pressure Black Buna-N Rubber Tubing 9/64" ID, 15/64" OD, 3/64" Wall Thickness ($1.40/foot This kind is jacketed—it looks like that VW tubing and Audi diesel tubing.