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Weeping fuel lines

4551 Views 10 Replies 7 Participants Last post by  sleeping giant
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:
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I've changed almost all of the fuel lines on my truck. None of them are particularly difficult to change with the exception of the lines that go to the sending unit on top of the fuel tank and the line that goes from the fuel filter to the injection pump.

Just route them all the same as the old ones and reinstall all of the clamps that prevent the lines from vibrating and you'll be in good shape. Also, remember to bleed the fuel system out before you attempt to start the truck after you do any work on the fuel system.

All synthetic fuel hoses are compatible with biodiesel (basically, any of the new manufacture hoses - that's what has been used on most cars since 1996 or so). It's the natural rubber hoses that don't hold up, but I don't think you can even buy them anymore...

Hope this helps! :)
The questions "how much flexible fuel line will I need" and "is there any flexible line between the fuel tank and the fuel filter" depend on whether or not you have dual fuel tanks. If you do have dual tanks there are rubber lines at the tank switch which will need to be replaced and that will probably require three feet of line. In addition, you will need another foot or so of each size of hose to connect to the sending unit on the second tank.

Also remember that you will probably need to change the return lines on the fuel injectors unless you have already done so. As I recall, those use 1/8" ID hose. Depending on what type of hose you use you may or may not need clamps to hold the lines on. You will need about 6 feet of hose to do the job.

Hope this helps! :)
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