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post #1 of (permalink) Old 09-15-2000, 01:34 PM
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high pressure fuel lines?

i am in the process of installing a efi from a 89 ford f150 onto the 351w that i have in my jeep. my question is it uses fuel lines with special clip fittings that you have to use a special little too to get them off. is it necessary to use fuel lines with these fittings? where can i get them? any help would be greatly appreciated.

brian wilson
80 cj5 "high 5"
stretched to 100" wb
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post #2 of (permalink) Old 09-15-2000, 02:24 PM
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Re: high pressure fuel lines?

Hey Brian I know those little fittings very well. I had to pull the upper and lower intakes off my old 89 Bronco three times for coolant leaks between the intake and head. I would think that if you stick with fuel line and clamps rated for fuel injection (high pressure), you could eliminate those fittings. The Mopar MPI kit recommends using EFI rated lines and clamps which you can buy at NAPA and the Ford EFI has similar fuel pressure as the Mopar kit (22-25psi).

'75 CJ5,258 w/Howell EFI,T18a,4.27's,33's,On-board air,Warn 8274
post #3 of (permalink) Old 09-15-2000, 02:52 PM
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Re: high pressure fuel lines?

I just put FI on my chevy 350, the max pressure it has is 18psi. Definitely use hose rated for fuel and hard line it everywhere possible, but I doubt your FI system is much higher in pressure than that.

89YJ-350V8,35" swampers,etc.
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post #4 of (permalink) Old 09-15-2000, 05:20 PM
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Re: high pressure fuel lines?

I believe the MPI kit pumps fuel from pump to rail @ 70 psi, that is why you need good piping.

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post #5 of (permalink) Old 09-15-2000, 09:03 PM
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Re: high pressure fuel lines?

My 95 YJ had fire damage when I got it, including the fuel lines. I didn't want to spend $150 on factory replacement line , so I installed fuel injection grade rubber lines. I just clamped the hoses to metal lines. The fuel injection hose clamps are designed to not cut into the hose when you tighten them.

I had a problem getting line that fit good. There was quite a difference between line from different companies that was suppose to be the same diameter. Some of the line would not clamp down tight enough not to leak under pressure.


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post #6 of (permalink) Old 09-15-2000, 11:59 PM
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Re: high pressure fuel lines?

jfralph is right.
An MPI's relief valve pressure, even with an adjustable fuel regulator, is 46 psi max. Sources tell me that 42-44 is about right.
That's a heck of a lot more than 18 psi !
Use that EFI hose! and clamp it down well....

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post #7 of (permalink) Old 09-16-2000, 05:46 PM
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Re: high pressure fuel lines?

Most MPI fuel pumps are capable of 100psi if a line or pressure regulator gets blocked. The EFI rated line should cost around $4 a foot, regular fuel hose will not work! Be sure to use hose clamps that have smooth inner sides, regular clamps will cut the hose and seriously weaken it. Inspect the hoses regularly and route them as far as possible away fro the exhaust and moving parts.

Hope this helps, good luck!

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