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Old 09-13-2014, 10:23 AM   #1
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PEX as fuel line?

Just wondering if anyone has used PEX as fuel delivery lines on your skoolie. I'm converting the single 65 gallon tank to dual 80's and am redoing the entire fuel delivery system to include manual delivery and return line valves as well as a fuel/water separator. I'm thinking PEX would do the job nicely but can't seem to fine any comparability to diesel fuel listed anywhere. Seems odd as it appears to be made from the same material as fuel tanks.

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Old 09-13-2014, 11:08 AM   #2
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Re: PEX as fuel line?

From what I have read it gets a thumbs up.
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Old 09-13-2014, 12:55 PM   #3
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Re: PEX as fuel line?

I have it as a the pick up in my veggie tank. No problems.
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Old 09-13-2014, 03:23 PM   #4
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Nylon is the best

Pex and nylon do not do well with any heat. These products must be mounted away from heat. I use mostly nylon but the last few feet near the engine is copper with a 3/8 fuel hose as a coupler. These products do not do well with any rubbing or abrasion. Frank
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Old 09-14-2014, 10:11 AM   #5
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Re: PEX as fuel line?

Thanks for the replies everyone. Heat is not going to be much of an issue as the fuel lines on the original tank are nylon type as well and held up just fine for 18 years. I'm remote locating a fuel water separator in the compartment just below the drivers window where there used to be flasher wiring and such (been removed). The bends will be large radius, out of the sunlight and away from any extreme heat. Using something like PEX over standard rubber fuel hose will allow me to go with a larger I.D. and less fuel restrictions in the lines themselves. I always oversized fuel lines in the boats I built for customers in the past and it has always been a good idea.
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Old 09-18-2014, 12:05 PM   #6
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Re: PEX as fuel line?

I think it would work, but I would stick with something that has an SAE certification printed on it, if anything from an insurance standpoint.

http://www.dormanproducts.com/c-386-fue ... ?pagenum=7
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Old 09-28-2014, 03:02 AM   #7
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Re: PEX as fuel line?

How do you connect the PEX tubing to the fuel hat or pickup or similar? Unless you are spec'ing the ENTIRE system to the ID of the PEX I see no value in running larger fuel lines except being able to go 25' farther when running completely out of fuel. If you connect 1/2" ID pex to a 3/8 id metal pickup or fuel hat you still have restriction. The only way I see to get aound that is to plumb in a fuel system in AN lines. I just did that on my 700 hp mustang, -10 supply -8 return PTFE hose and just the lines and fittings were in the $400 range.

If it were me I'd use good old rated rubber line in conjunction with some steel or ally hard lines. Unless you are needing the flow for a 500+ bi or tri turbo beast whats the point in risking untested lines? And if your bus is that bad then surely you have the $$ for the AN stuff (and I want pics! LOL)!
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