Fuel Pressure Regulator Question..?

[BottleFedGTS]

Will the stock fuel pressure regulator work with a 255lph in tank pump? My fuel pump just cav'd, and i have a 255 walbro in my parts cache, which'll be handy after h/c/i + more nitrous. It'd be nice to be able to just chuck it in.

[The Fox Master]

Yes the stock one will work just fine. High output pumps are about volume not pressure. Adjustable regulators are completly pointless on mass air cars as any changes you make in fuel pressure will be slowly be compensated against by the computer by cutting or raiseing pulsewidth until it reaches what the computer thinks is ideal - the computer always wins.

[BottleFedGTS]

Thanks FM. Time to drop the tank.

[The Fox Master]

NP, have fun

[ronburgundy]

wait till you do the h/c/i swap for the reg. that's the best time to do it. only reason i went to an aeromotive was to make sure my extended crank starting would be cured for once and for all. plus it looks really cool. don't bother changing the reg, unless it could be causing problems. they don't fail very often.

[Matt94GT]

I even have H/C/I but my fuel pressure is still at the stock setting didnt really notice any benifit to bumping it up.

[Darren5.0L]

Usually the fuel pressure is not adjusted for a bump in power, but as a band-aid for stretching injectors beyond their factory limitations. Much in the same fashion a FMU is used in many Supercharger kits, upon entering boost the FMU spikes fuel pressure which in turn makes the injects push out more fuel with the same pulsewidth. However this makes the injectors perform sloppily and is not the best way to set-up a car. Technology has moved far beyond the quick and dirty ways of fuel delivery. (like adding a 9th injector...)

There have been times on the dyno where small amounts of power can be gained by minute adjustments to fuel pressure (less than 2-3 lbs) but unless you have the dyno time to mess around, you are tuning blindly.

Overall, not recommened nor required at this point .