slimerept

The pressure release valve is junk, and in a landfill somwhere. The cap has nothing to do with it.It was poping before i replaced it.

moorepower

Have you tried going back to stock tune? It will run, just won't make the power. I had a similar issue with smarty, I need to download new program and try it.

slimerept

yea i tried the stock tune, power is still good because of the injectors and cam n stuff BUT it still does it. I REALLY think I have an FCA issue. MY rail pressure is 10-12k while 55MPH on the freeway Is that too low?

RobV2500

i think your fuel control piston in your FCA is scored and is sticking because of dirty fuel or just debris coming through the system through the years. do u mind taking the time to removed the FCA from the pump and dissassemble it and take a good look at the piston to see if it is smooth and unscored?

slimerept

I have a new pump with stage I fca comming in tomorrow or monday, ill just remove it then when I replace the unit. With the 37's I HATE hovering wtih my knees on the bumper, so i dont want to do it twice this weekend,

RobV2500

yea just keep us posted. i really think the problem is with your pump but more precisely in the FCA.

buzzinhalfdoz

my truck is not moded nearly as much as yours but, when my rail pressure sensor(ouch 500.00$) went out(about 200,000 miles) the truck poped and bucked and had no power, it would start right up but run like he**. keep us posted...

slimerept

what about your egt"s? I can hit 1800 in a matter of 2 -4 seconds

mudder500

If ur hitting those egts that quick, u need to park it before u buy a new motor!!

slimerept

lol what kind of advice is that? yes dude, im out there at the drag strip running 1/4 times right now. Tomorrow Ill be sled pulling. Of course the truck is parked.

mudder500

It was the only advise I could think of about ur problem!! Lol

slimerept

sorrry i was trying to be sarcastic, I hope that came across

slimerept

Anyone ever tried one of those ebay modded rail pressure sensors?

mudder500

Naw I understood what u was saying.

Big Blue24

I think you have lift pump issues. Sounds like your sucking air at times and I'll bet your rail pressure is all wacky from compressed air bubbles. You might be time and money ahead to fill up a bucket with #2, run a fuel line from the bucket to your lift pump and see how your truck idles.

You might even add a section of clear vinyl hose before the CP3 so you can look for bubbles. The vinyl will not hold up long term, but long enough to do a thorough week long test.