Fuel lines

[J-440]

Ok people, I got another one. I'm hoping to put 750 horses out of the fly with a 440, EFI, S-charged Charger. I wanna know what size fuel lines you guys use. Will the stock 3/8 line be cool with a very high volume electric pump? Or how about some 1 inch PVC pipe? I won't be needing the 5/16 return line obviously and am wondering if braided lines expand too much. Hook me up people, what do you guys reccomend? Later.


J-440

[23T]

Braided lines will expand 0 that's why you use them on brake lines, fuel will melt the PVC so do'nt even go there. The 3/8 will be marginal I'd use 1/2.
Just my $.02

[Slingshot383]

For a supercharged EFI set-up, I'd go with either a braided or steel 1/2" line. You will also need a return line for EFI systems as that is how they control pressure at the injectors and fuel rail.

[451Mopar]

First, what fuel injection are you using?
I think for 750HP you will need a modified single plane intake with port fuel injectors and a really big throttle-body. When I talked to Holley none of the throttle-body fuel injection units they sell will support this power level because the injectors were too small.

For fuel line you should use 1/2" minimum. For a carbed engine you may even want larger, but because Fuel injection runs at higher pressure the fuel line can be slightly smaller. A return system is required for almost all port injected Fuel injection systems.

[J-440]

451, more than likely when Edelbrock's EFI system comes out for the 440, that is the one I will be buying. I have a long way to go, so I'm asking a lot of questions before I put the whole thing together. Now about braided lines, since there is rubber inside and the steel mesh wrapped around it, I heard that there is a big chance of expansion. With solid lines you don't get that. Fuel wise I guess would be safe but entire car length brake lines? Fill me in on the benefits of braided vs. solid lines. Thanks guys, have a good one and God bless.


J-440

[23T]

SS braided lines WILL NOT expand any noticable amount, the pros 1) felxable and easy to run 2) the SS braiding resist wear from rubbing. Con high$$

Why not run a combo of braided and simi ridged line for your fuel delivery system

[J-440]

Ok none of you guys laughed about the PVC pipe remark. You know I'm kidding right? Ya'll recognize sarcasm here? Anyway, thanks for the input and it looks like the 1/2 inch braided hose is going to be the way to go.


J-440

[451Mopar]

1/2" aluminum line is a real pain to bend and shape to fit the car, then you still need some type of flexable connection to the engine, and maybe the fuel pump and fuel cell, which means you have to buy extra AN connectors and ends which are expensive.

I did the mixed combination of hard line and braided, and my hard line developed a crack after two years, so I just went with all braided lines which are much easier to install.

On the smaller lines, like the brake lines, the braided lines have teflon tubing inside, not rubber so they don't expand with pressure.

Search this site about the Edelbrock FI system, there should be some info about it from Rodger H because I asked him if it would support high HP levels. I think he said you would need higher flow injectors for more than 500 HP?

[66Dart_GT]

1/ 2 inch aluminum line Is a lot easier to form and flare than steel and another fact about aluminum is if you are using AN fittings they are 37Deg flares, ½ inch aluminum is 3/8 inside diameter as tubing is measured by outside diameter and wall thickness, as far a using braided host, the cost is prohibitive. One other item mentioned above “with high pressure system you don’t need as big a line” Are we talking flow rates for engine requirements or pressure requirements? Just some thoughts.

[J-440]

Yo Dart, I'm still reading up on the fuel system since this will be my 1st engine build. As far as injectors go, yeah, I'll need some big ones. For around 750 horses, I'm guessing 1000 cfm? The car will be road raced so the foam in the stock fuel tank will be added as well as a beefier sending unit. I've seen a few high flow electric pumps in Summit for my app which is why do I need a return line? Mechanical pumps I can understand but I was under the impression that electric pumps eliminated the extra line.
Thanks for your help guys, I'm soaking in all this as I build my beast one step at a time.


J-440

[#nineteen]

Go with a Magnaflow EFI pump, and talk with them about the proper setup. I run -12 from the tank to the pump, then -10 to the reg up front...this is on a Dominator carbed moder. I run A Product Engineering pump...