Fuel pump question

Originally Posted by TBatt

Just got off the phone with Ivan at Stillen, he thinks the pump has failed and is sending me a new one.

I'm pretty sure the wiring and such is okay because of the way the problem got worse over time. When it first happened, the fuel pressure had dropped from 55 psi down to 40 and by the time I got home it had dropped to around 15. Sure sounds like the pump motor was giving out or something was progressively clogging up.

I will need to partially drain the fuel tank. When the tank is full, the fuel level is above the opening for the pump and it will spill out. The FSM says that I will need to drain about 4 gallons out from full. I plan on attaching a hose to the output fitting and let the pump drain the fuel into a gas can. I will be sending power through the pump connector so I can have it run without the engine running because the engine won't run without fuel. It the engine isn't running, the ECU turns off power to the pump.

It could be a regulator problem like you stated. I sure hope not because the regulator is not sold separate from the pump assembly and the whole pump costs $500. Ouch!

Originally Posted by FairladyZ40th

So you have a 255lph pump and still require a regulator? I was told I'd be ok without a regulator using a 340lph pump


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Originally Posted by TBatt

The fuel pressure regulator is part of the fuel pump assembly. It is built in.



I would NOT change the pump from the stock setup unless you are going to forced induction (turbo or supercharger). It is a real pain to swap out and you just don't need that much flow with a stock setup.



Most of the guys I have seen using the 340 and up are also using a return line fuel system and those guys are running lots of boost and or E85. The 255 Walbro pump is good up to 450-500hp. Beyond that you will need to go to the 340. If you run E85 and high boost you will need the 450.