Fuel Line Question....
11-09-05, 09:17 PM
#1
Rotary Freak
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Join Date: Jun 2003
Location: Land Of Confusion southern MI, USA
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Fuel Line Question....
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?
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?
11-10-05, 12:22 AM
#3
FB+FC=F-ME
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.
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.
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11-10-05, 07:00 PM
#8
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.
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.
11-10-05, 07:13 PM
#9
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.
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.
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