Quikenuf

Ive heard a few people talk about the new GMs having an adjustable pressure regulator. i am wondering
1. where is it located?
2. what do i need to adjust it? (tool wise)
3. Any gains from it?
4. is it worth messing with on a basic bolt on truck?
Justin

ranwalk

iTrader: (1)

its located on driver side fuel rail.
tool-takes a size 8 tamp proof bit
probably no gains on a basic bolt on truck
heres a pic
<img src="http://www.sighost.com/user/ranwalk/fuelregulator.jpg" alt=" - " />

Quikenuf

while adjusting the regulator to give a higher pressure will i need to turn the screw clockwise or counter clockwise. also will this increase the pressure to the injectors thus giving engine more fuel? i have tried a buddys HPP3 and with the 92 octane tuning i still have lots of "pinging" even with 93 octane fuel from mobil. i want to get a programmer but i dont want the pinging at all. and i know more the ping is from being a little lean, so would turning up the regulator put more fuel in the motor
to richen up the mixture so i could run the 93 tuning with the Hpp3?

ranwalk

iTrader: (1)

you turn it clockwise to adjust.you will need a fuel pressure guage that you can run inside the truck if you dont have one already on board.i wouldnt just blindly adjust it with out a guage to check it with.i would think that yes,more fuel pressure will result in more fuel.to an extent anyway.

rphinney

I dont think it will work because the computer will adjust the injector pulse to run the mix back to the way it was before any adjustments, if you had ls1edit or something to play with the air fuel mix then you could get it done but the gains here would be minimal.Just my 2 cents

oxidizr

iTrader: (4)

While what rphinney said is partially true it not the case at WOT. At WOT the fuel tables are set and the computer will not compensate, this is where the added fuel will prove its benefit...trust me I am still running a dry shot with between 120-150 HP settings and don't run lean. I get 60-61 psi of pressure at WOT and don't have lean concerns. Even at PTO the computer will not and cannot compensate to the extent to completely cancel the benefits of adding fuel.

OOsilverado

i just did that in my truck and it made a noticable difference. i did it kind of blindly, but im gettin a gauge soon so i can actually see what is going on