i am upgrading my car with a turbo, and im also upgrading my fuel system, i have a walbro 255 lph pump.

And my question is, i know i need to increase the size of the return, but do I...

1.) Have to use a hard line,
2.) Or can i just use rubber hose?
3.) Or do i have to fork out the cash and get ss lines?

 

use unversal brake line, then bend it yourself. i dont think running rubber hose the length of the car would be a great idea...

 

Heres a WAY easier route.....
Hit the wrecking yard and just pull another feed line off a 1st gen.Itll fit right along side your existing feed line and will move enough return fuel for just about any EFI setup you dare put in a 1st gen.
A 5/16" feed and a 5/16" return puts you at the same sizes as a TII, and those guys rarely need to upgrade their hardlines.

 

damn ya, that is some great thinking.

 

That was just another of my "keep it like stock" steps, when I thought up the fuel system for the TII swap.

 

thats cool too, cause i have a parts car, thanks.

 

i got it off...

 

As a side note, the 12a feed line is the same size as the 13b return line. You will need a 13b supply line if you want to upgrade the return on a 13b.

I replaced both supply and return with 3/8" aluminum, due to the size of my 'way too big' fuel pump. The pump required at least a 3/8" return. Bought a 25' roll of tubing at the local race shop for under 20 bucks. Spent that much again on the good clamps and fi rated fuel hose to finish the install.

 

Steve, that's a great idea. Here's what I did on my GLC. It has three 1/4" lines for: send; return; tank breather. The first upgrade was a high flowing Carter pump for my carb and when I hooked all three lines together, the flow rate was very adequate. I used 3/8" line at either end.

When I upgraded to EFI and a Walbro 255, I installed a 3/8" steel brake line massaged to conform with the lay of the land under the car. To keep it away from exhuast heat, I mounted it on the opposite side of the frame rail to the run of the stock steel lines (this was a piston powered car, and the lines are on the intake/exhaust side of a rotary engine). I used steel line because I was in a hurry to get it plumbed, and didn't know where I could source aluminum line. The whole thing cost about $25 including brake line, FI hose, and the good clamps. Actually, closer to $30 if you count the mod I performed on the three stock lines to convert them from low pressure send, to FI return line status.

The result is a fuel system that reaches correct pressure in very little time, and flows like ice cubes on a warm day.