Thread: fuel line identification help

I got a question for you. I am trying to do a steel braided line to my fuel return line. The problem is, is that I cant seem to trace this thing back to the tank. I tried to follow the line down below the brake booster, but then it turns a few tims and I loose it. Not to mention that I blew a CV boot one time and allot of the greese is still flung around everyware. Do you know off hand witch line under the car I need to cut. Here are some pics I took.
Pic #1
Pic #2
Pic #3 (looking twords the rear of the car)
The line with the AN fitting you see in the pics is the fuel feed line that I had done previously.

Take a dremel with a cut off wheel and start cutting them all. The ones that catch fire first are the fuel lines.






It was just a suggestion

I dont know which are which from the pictures, but my engine bay is wide open and I might be able to crawl under there and see if I can identify them and relay that info to you. But it would be tomorrow at the earliest before I could do that. I feel like crap right now and desperately need to be in bed.

Originally Posted by SyntheticShield

Take a dremel with a cut off wheel and start cutting them all. The ones that catch fire first are the fuel lines.

Start from the top, have someone pull and move around the return line while you are under the car looking to see which moves

Under the car you'll see the 5 hard lines. The 2 smallest are the rear brake lines and the largest is the feed line which you already have setup. Of the remaining 2, the one to the outside is the EVAP line. That means the other 5/16" line is your return line.

So looking at this picture of yours here...



The line on the left of the feed line is your return line which is 5/16". The one on the far left is you evap line. I just got done doing mine not too long ago. I'll post pics when I can.

Hope this helps...

Way to go Shawn!

Indeed, great work. Nothing like a fresh memory to get it all organized.

Thanks guys, I ordered this today
Earl's Performance 165056ERL - Earl's Performance AN to Tube Adapter Fittings - summitracing.com
I hope that with this, I will be able to do the return line with no more problems.

Originally Posted by TDCRacing

So your just doing the return line and not the feed? any reason for this? and you said you were going to the tank with it..so what just right above the tank you will ct the lines there and atach the braided hose to the stock tubing with the an to tube fittings?

I already have the fuel feed line done. I did that a few years back. I am just tired of the ugly return line. Its gay. I wont be going all the way to the back of the tank. Thats just to much stainless steel line and I am not rich. I will be cutting the stock return line right ware it goes under the car under the driver seat and attaching the AN adapter there.

Best spot to cut is there it makes the 45* turn before it turns up the firewall IMO.

Originally Posted by VinnieGTP

Best spot to cut is there it makes the 45* turn before it turns up the firewall IMO.

Thats where I put the fuel feed line adapter. Its right before the line curves up to go into the engine bay.

Mainly to get rid of leak POS quick connects. Those o-rings are a ***** to replace and not worth the time IMO. Besides, with aftermarket rails the braided line looks way nicer, but thats beside the point.

Another reason to loose the OEM GM disconnnects is to get rid of the potential fire hazzard for good. Several of us believe the GP fires are from the quick connect o-rings instead of the valve cover gaskets.

Hope this helps...

Thank goodness for this thread!!! I am doing them right now, and had the same problem

If and when I do this for my car, its going to be AN line from tank to engine. I'm not going to tap into and tap out of the hard metal factory lines, I'm going all the way if I am going to do it.

~F~

If/when you decide to convert to E85 and see the cost of braided teflon hose, you may change your mind

I went filter up on the feed side and firewall up on the return, probably took 3hours including leak testing, the factory plastic brackets do fit -6an hoses if you remove the plastic tabs that are meant to hold in the solid line....


My line is nitrile based so it is good for all fuels up to methanol (so the company says) and it was $ 80 for 20ft.....Which is about 3.5 feet too much for my needs, To go tank to engine is about 16ft each way(rough geuss and does depend how you route it.)