Somebody Explain to me the fuel return
07-01-2005, 10:46 PM
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Somebody Explain to me the fuel return I have a lsx manifold and the fast fuel rails. I already had the plumbing designed until I was told I need a fuel pressure regulator and a return line. I have a 2001 SS Camaro. The way the system was going to be plumbed was to have coming off of the stock fuel line a -6 adaptor to a -6 line feeding up to the front of the drivers side fuel rail. The back of the drivers side fuel rail has -8 crossover to the passenger side fuel rail coming up to the front where a fuel pressure guage is.
On the stock system there is a hose coming off of the manifold just behind the throttle body running to the evap solenoid which has a line coming off to another line running down beside the fuel line. What is this line.
So the question is, do I need an external fuel pressure regulator and do I need a return line? And if I do, how?
On the stock system there is a hose coming off of the manifold just behind the throttle body running to the evap solenoid which has a line coming off to another line running down beside the fuel line. What is this line.
So the question is, do I need an external fuel pressure regulator and do I need a return line? And if I do, how?
Last edited by SS125; 07-01-2005 at 10:57 PM.
07-02-2005, 10:17 AM
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On the stock fuel system the return is in the back by the fuel pump. Do you need a regulator and a return? well thats up to you, if you want to be able to adjust the fuel pressure than you need a regulator, with the regulator you need a return. If you are just putting on the rails you dont need the regulator and return.
07-04-2005, 09:12 PM
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Okay, I've been doing some research on this return line and here is a post form Mightymouse that I found
"you guys all have a return line and a regulator mounted on the end of it. it splits off the pressure line right after the filter.
if you want to modify to run a full return with stock regulator all you have to do is unhook the stock return from the T fitting under the car.. block off the hole in the T, and run some fuel line from the end of the rail back to the tube you just disconnected.
having a return line isnt the problem.. its acess and quality of the regulator."
So today I got under the car and found this t-fitting. Still I don't understand it. The fuel line runs from the fuel rails to the fuel filter. Coming off of the fuel filter a line 90 degrees to this t-fitting. Straight across on this t-fitting another line comes off and goes to the fuel tank. This is the feed linee. Now that leaves one more end off of that t-fitting. It looks to me like the evap line runs to this end of the fitting. How the heck does this work. I thought the evap line pulled excess vapors from the tank to reburn them. So, how can this be used as a return line. It would be nice if that were the case. But I just don't understand how any of those off that t can be used as a return line. Can anybody explain this any better?
The entire post can be found here https://ls1tech.com/forums/showthrea...e+instructions
"you guys all have a return line and a regulator mounted on the end of it. it splits off the pressure line right after the filter.
if you want to modify to run a full return with stock regulator all you have to do is unhook the stock return from the T fitting under the car.. block off the hole in the T, and run some fuel line from the end of the rail back to the tube you just disconnected.
having a return line isnt the problem.. its acess and quality of the regulator."
So today I got under the car and found this t-fitting. Still I don't understand it. The fuel line runs from the fuel rails to the fuel filter. Coming off of the fuel filter a line 90 degrees to this t-fitting. Straight across on this t-fitting another line comes off and goes to the fuel tank. This is the feed linee. Now that leaves one more end off of that t-fitting. It looks to me like the evap line runs to this end of the fitting. How the heck does this work. I thought the evap line pulled excess vapors from the tank to reburn them. So, how can this be used as a return line. It would be nice if that were the case. But I just don't understand how any of those off that t can be used as a return line. Can anybody explain this any better?
The entire post can be found here https://ls1tech.com/forums/showthrea...e+instructions
