dcsst28

Hello,

I've recently replaced the fuel lines on my 1986 Coupe GT with 5/16" brake line. I realize the original fuel lines were 8mm, but 5/16" works out to be 7.9375mm, so I think it is okay. My question is did I do it properly? I kept the fittings for the fuel filter and fuel distributor, and I used high-pressure rubber hose to connect the fittings to my new lines. I will include a link to pictures, so you can see. Please give me some advice as to whether this is good or not. I can always change to compression fittings if necessary, but the residual pressure in the fuel lines is good, as it starts up easily after long periods of time without running.

Thanks.

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Rogviler

It may work. I would keep a close eye on it. Remember that you're looking at 100 psi or so, and of course a fuel leak will quickly kill a car all the way to the ground...

I can guarantee you won't have any problem with a compression fitting. I have them on two of my cars, and I wouldn't hesitate to go that route again. I'd do it that way just so I wouldn't have to be constantly worrying about it.

-Rog

dcsst28

Okay, I appreciate the advice. I just want to ask are you concerned that fuel may seep out of the ends of the hose, or are you concerned that the hose may burst, or both? I checked it out and the highest the fuel pressure is in the lines is around 5 bar, which is 72.5 psi. The hose is high-pressure hose, which can handle more than that. Do you believe fuel could seep out even though I double clamped it?

I will try the compression fittings if you feel my technique will lead to a fuel leak.

Rogviler

I wouldn't be concerned with it leaking tomorrow or next week so much as it breaking down due to engine heat and even that corn-based crap they put in our gas now...

Tough call. What kind of chemicals is the hose rated for?

-Rog

dcsst28

I don't know all of the chemicals it is rated for. I bought it from NAPA, and they told me it would handle much more than 72.5 psi, but they did not say anything about what chemicals it is rated for.

I see what you mean about it breaking down, though. It does get pretty hot under that hood. Maybe I should ask someone from NAPA about the chemicals it is rated for. Or I could just use compression fittings...

I'll contact NAPA and see what they say.

dcsst28

So, I called NAPA, and the guy said it the fuel hose was rated at 225 psi. He did not know about the chemicals it could handle.

I am probably going to use compression fittings; I just don't know how I am going to deal with the curved pieces yet, but I will figure something out.