return line modification???

[Turbo Monk3y]

Well due to my 58-59 psi Base pressure and no money to afford an AFPR right now i was wondering if i could just run some 5/16 gas hose from the end of the FPR to the return line on the fuel pump. And some how just route the hose along the path of the other fuel hoses. I am sure when i do this i will get back to 43 psi base pressure. i have a vr4 180lph rewired and everyone says i should be fine with this pump and should not have overrun. This led me to believe something in my return line must be stopping the normal flow of fuel. Is this safe to do??

 

[98TsiAWD]

Well due to my 58-59 psi Base pressure and no money to afford an AFPR right now i was wondering if i could just run some 5/16 gas hose from the end of the FPR to the return line on the fuel pump. And some how just route the hose along the path of the other fuel hoses. I am sure when i do this i will get back to 43 psi base pressure. i have a vr4 180lph rewired and everyone says i should be fine with this pump and should not have overrun. This led me to believe something in my return line must be stopping the normal flow of fuel. Is this safe to do??

That fuel pump when rewired will overrun your regulator. If you leave it wired stock it wont. I really think this is your problem.

But if you want to run new 5/16" hose to teh back go for it. Just run it along y our stock fuel lines and gently zip tie it around them.

 

[DSMJim]

The bigger line wont fix the problem. THe problem is that your FPR does not have a large enugh passage past the diaphram to let enough fuel back to the tank to keep the pressure down. It's currently wide open and fuel is still backing up causing the rise in your pressure.

The 1/4 line is large enough for a 255HP re-wired to flow enough back to the trank. I can drop my fuel pressure to 20-30psi if I want to with my external FPR. I went the cheap route and used a SARD unit and some brass fittings and fuel hose to save money. It's not a pretty as the earls fittings and aeromotive regulator but much easier on the pocket, trust me. Check my gallery for info.

 

[Turbo Monk3y]

Well your right jim i did a 5/16 line back to the pump and yes the pressure did drop from 60 psi to 49-50 psi but its still not where i want it to be which is 43 psi with the vac hose off.

 

[98TsiAWD]

Well your right jim i did a 5/16 line back to the pump and yes the pressure did drop from 60 psi to 49-50 psi but its still not where i want it to be which is 43 psi with the vac hose off.

Try "unwiring" the pump and run it with stock wiring and see what you get, if still off you are gonna have to get an AFPR.