Fuel lines for EFI

[PaulW]

I am about 90% decided to switch from a carb to either the powerjection or ez-efi system. My question relates to the changes required to my fuel lines.

I know I will have to add a return line and I will be using an external pump. I currently have a single 3/8" combination rubber and steel line setup. I used standard 60" teflon coated steel lines with 45 degree flares and a union at the halfway point along the frame rails.

I just want to install a simple plain set of lines and am not concerned with looks as it is all under the car anyway.

Can I use the current hard lines and use proper barbed fittings from them to EFI rated flex hose?

Some of the info I have seen says to stay away from steel lines and use all flex line but IMHO the OEMs all use a combination of steel and flex lines and besides I forsee difficulty in supporting a long run of dlex line horizontally along the frame rails.

Any and all advice would be appreciated.

[MPTech]

I went with the FFR directions and ran flex from the in-tank fuel pump, to the filter, then flex again to the hard-lines (just above the rear axle). Then I ran hard-line all the way to the front of the footbox, then AN fitting and braided fuel lines to the fuel rails.
I like the hard-lines along the frame rails, under the floor pans.

[lbperry]

Paul,
There's a returnless option for the Powerjection III system. It cycles the fuel pump on to maintain fuel pressure. I'm not sure about the EZ-EFI system. Modern fuel systems use this technique rather than a return line.
Good Luck,

[rich grsc]

Originally Posted by PaulW

Can I use the current hard lines and use proper barbed fittings from them to EFI rated flex hose?

Some of the info I have seen says to stay away from steel lines and use all flex line but IMHO the OEMs all use a combination of steel and flex lines and besides I forsee difficulty in supporting a long run of dlex line horizontally along the frame rails.

Any and all advice would be appreciated.

I think that is completely false, use as little flex line as you can.

[PaulW]

Originally Posted by rich grsc

I think that is completely false, use as little flex line as you can.

I agree. Flex line to filter and pump, then hard line all the way to the Engine compartment.

[mirose]

Originally Posted by rich grsc

I think that is completely false, use as little flex line as you can.

Whoa there cowboy. I used 100% flexible Stainless Braided teflon lines from gas tank to engine and back again. Ridiculously easy to route and install. I only needed a minimum of fittings and it looks great.

I get it that the general feeling is that the hard lines are a bit more resistant to damage from a rock or what not, but the SS hose is VERY strong IMHO. Also, My understanding is the Teflon hose is very resistant to degradation and should last a very , very long time (as long as you use a good brand).

I know there are diverging thoughts on this topic, but I just want to get it out there that running flexible lines the whole way is fine too., at least I think so.

Here is a pic from a zillion years ago when I was mocking up my lines....they are just taped in place with electrical tape but it gives you an idea of how this went in



-Michael

[ZoaFan08]

I also ran stainless Teflon line from pump to fuel rails.