tpi fuel line, can i use nylon fuel line? or? cheap is good

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Silent viewer

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May 9, 2007
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i am finally doing a tpi setup on my cutlass (actually i am swapping motor from calais to 442 first) and one onf my big issues is the fuel line. it needs to work for efi so rubber hose is a no go. my neweest idea is what if i went to the salvage yard and found a lt1 camaro (2 of them there now) or lt1 caprice or maybe any efi car? and pulled the nylon fuel hose from it and then buy the fittings for the ends to connect it to my fuel rails and gas tank? does this sound like it will work? it seems like the nylon lines are used on near all new cars so i do not see why they would not worka nd they seem like they are very durable, i have never heard of one breaking.. has anyone else done this? any other budget minded ideas to run the lines? the nyllon idea would cost less then 50 bucks to get used lines form the yard and all of the needed fittings....
 
They should work. Its just a matter of finding the lines with bends that are close to what you need. I think the only problems they have is with the quick disconnect fittings, sometimes they leak when they get older, but that is rare.

Also, they do make rubber fuel lines that are designed for fuel injection. It would be cheaper, but they probably wont last nearly as long as the nylon lines and are more likely to leak.
 
I personally would just go with fuel injection rubber hose. The nylon would be ok but the last time I messed with it I broke the quick disconnects off fairly easily(it was really could, might have had something to do with it). The replacement quick connects were expensive.
 
how much pressure does TPI need? if it only needs 10psi then the high pressure rubber hose is fine, otherwise i'd just make steel lines.
 
megaladon6 said:
how much pressure does TPI need? if it only needs 10psi then the high pressure rubber hose is fine, otherwise i'd just make steel lines.

I dont know if he was planning on using rubber or nylon lines for the whole fuel system, but either way he needs to have something flexible at the gas tank and engine. Having the fuel lines secured to the frame, they need to be able to flex when the engine or gas tank moves, since the engine and body are not "fixed'" to the frame.

My assumption was that he was using steel lines for the length of the car and the rubber or nylon for the engine and fuel tank.
 
My fuel pump pumps out about 50 psi. you can get Goodyear rubber hoses that are rated for 50 psi at autozone.
A lot of cars that are stock use a little bit of rubber for the movement factor. I probably wouldn't do the entire car with rubber, I'm assuming you're just going from the piece of metal in the frame to your fuel rail.
How much pressure are you putting through it?
 
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