Your fuel pressure should be around 40psi I believe. 38psi if I remember correctly. You MUST have a leak somewhere in your fuel system. I'd recommend checking the injectors seals . Check the o-rings on the feed end of the innjector and the seals where the injector sits in the intake manifold. It'll cost about next to nothing to replace both.

 

yeah im goin to pull injectors out sometime soon....just need to find time.....and im not sure how to do it, so i have to have time w/ my buddy to help.

 

Anyone has run 12:1 with stock injectors before? Maybe you are running past the injector duty cycle and they cant keep up.

 

Every RRM kit out there that I know of. (The base kits, some have upgraded a little)

 

Two bolts hold the rail down. Remove, and lift. Then pop out the injectors. It may take a firm tug or a little twisting, but they'll come right out. It's a lot easier if you disconnect all the choil packs and spark plugs because it'll give your hands a little room. You'll wanna depressurize the fuel system before you do this too, or else you're gonna spill fuel all over the engine bay.

 

how do u depressurie? unplug fuel pump and crank the car?

 

No, you don't want to crank the car at all. Don't even put it in key-on. Both turn on the fuel pump. I'm pretty sure just opening the cap on the fuel tank is enough. It's not going to kill you to spill a little fuel, and it evaporates pretty quickly. But if you have any electricity/sparks or fire nearby...it'd be wise not to risk it.

 

so let me get this stright....its just 2 bolts to remove the injectors?

 

Yeah, pretty much. The two bolts that hold the fuel rail down to the intake manifold. Oh! I almost forgot. There are two black plastic spacers that are about 3/4" tall. Don't lose them. I mean you don't NEED them per se, but they keep your injectors at the proper angle, so it's best not to drop them and then run them over.

 

lol ok.....im try this when i get sometime this week. just got outta Army and back home so i got other **** to take care of. but ill keep everyone posted on this.

 

ok well i took arpart the FMU and it looked fine.....so i put it back in....no change....then last night i swaped it out w/ a 10:1 FMU....no change....so if its not the FMU what could it be?

 

Fuel pump would be my next guess... change that and see if it corrects it. Also when you installed the fuel pump you did put the screen/sock back on right? If you don't do that any debris that gets in the tank(from filling up/etc) will get sucked into your fuel system.

Try switching the pump to a new one... you said you had a spare right?

 

yeah i got an extra one..

 

did you ever resolve your issue? i hate when people don't give me the last page of the novel!!!

 

yes i did.....got a new fuel pump....that was the issue....and swaped w/ my friends 10:1 FMU but im goin to put back my 12:1