Question: Will My FASS Feed My Fuel Needs?

[WisconsinHick1]

I have a FASS 150 and I am running a 120% CP3 will my FASS supply enough fuel? I am seeing low actually rail pressure on my pulling tune and I am trying to track the problem.

I have a little fuel leak but nothing I thought would cause me to lose 8000psi on the actually rail pressure.

 

[Dirtymaxx03]

do you have a fuel pressure gauge? I run a FASS 150 and Im on stock fueling, with stock fuel lines and on a 2800 tune i can put fuel pressure down to 3 psi from 11 psi. Running 1/2'' fuel lines from a sump to the cp3 may help you. Or maybe running a boost referenced regulator to increase pressure as boost raises. Or dish out for another 150 and run 2 lift pumps.

 

[WisconsinHick1]

No I don't have a fuel pressure gauge. I have 1/2 from top of the tank to the metal line on the motor.

 

[Chevy1925]

what size injectors?

 

[Dirtymaxx03]

No I don't have a fuel pressure gauge. I have 1/2 from top of the tank to the metal line on the motor.

if its at the top of the tank you are still drawing through the tiny factory draw straw. Id try a sump with a 1/2'' fitting and run 1/2'' from the fuel to the cp3.

 

[Hot COCOAL]

Yea a sump and remove the factory fuel filter block if its not been done yet, wait, is the fass 150 a dual filter too, or just a pump? If it filters fuel as well, i would remove the factory fuel filter block, i would think it would become a restriction pushing double what was intended through it.

 

[WisconsinHick1]

My injectors are 60%. The factory filter head has been removed. The FASS has the filters also.

 

[PureHybrid]

Who did the cp3?

Fix minor leaks, cant hurt. May want to look for a collapsed fuel line before the pump.

 

[Chevy1925]

Who did the cp3?

Fix minor leaks, cant hurt. May want to look for a collapsed fuel line before the pump.

x2 and how much pw are you tryin to command?

 

[Harbin_22]

Leak on the high psi side? If so it needs to be fixed bad.

 

[05smoker]

Fix fuel leaks. If that doesn't do it, I'd be curious if it isn't the CP3.

The FASS 150 should be able to keep up to that, even with a factory draw straw.

 

[WisconsinHick1]

John's CP3. Only looking for 2800 on the PW.

I suspect its the fuel leak.

 

[Dirtymaxx03]

If its on the high reassure side then that leak is definatelyour problem.

 

[Burn Down]

High injector return rates can also cause low rail issues & still have perfect balance rates. But as stated above fix your minor fuel leak and go from there.

 

[WisconsinHick1]

My last leak was on the high pressure side.

 

[616samuel]

fix the leak, then if it's still losing pressure could be in the tune... i run a fass 150, exergy 10mm cp3 and 100% over injectors, stock fuel filter still there and don't loose any rail pressure now...

 

[WisconsinHick1]

Well I tracked down my fuel leak and got that all fixed. Still getting low rail pressure. Now I need a gauge to check my supply pressure off my FASS.

 

[Sledheadxp800r]

I think im going dual lift pumps in the near future. Maybe 2 fuelab 200gph pumps with internal 20psi bypasses? Not sure yet.

 

[WisconsinHick1]

I am thinking my issue is a Fuel Rail Pressure Relief Valve issue now that I have had sometime to do some more reading.

 

[quadracer37]

the fass 150 from trhe factory only runs 5lbs or so, usually not enough to support high horsepower or big injectors. you can get different spring from fass to allow it to run higher pressure. i run mine at 10-12psi and it supports 80 over injectors and 3 stock pumps. drops a few psi on hard runs only. also make sure your filters are fresh.