c105.3

I'm having issues on my 5.3 swap into my 1966 c10 as soon as I switch the key the fuel pressure gauge jumps to the maximum psi on the gauge (over100) the truck starts up but after a few seconds it starts dying out and the pedal becomes in responsive (DBW) after that the pedal won't work again unless I continually flip the key on and off till the pedal works again , and once again the truck starts up fine but then accelerates really high only to idle really low and die out , I'm running a walbro 255 , corvette fuel filter /regulator combo , stock injectors and aftermarket fuel rail , when I turn the truck off the fuel pressure slowly starts dropping from over the 100 psi mark till about 45 then stays there for a while and drops more

Old Geezer

iTrader: (3)

What yr engine?
Return line issue?
Gauge whacked?
The pedal issue could be compatibility of the components. All components from the same donor vehicle?
What PCM, etc, are you using?
What are you using for a harness?
Post the tune and a data log.

c105.3

2001 suburban 5.3 all stock internals except for cam , tuned by black bear performance , stand alone with speed density tune to eliminate maf sensor due to set up , stand alone wiring , at first I thought the gauge was faulty but this is the second new gauge I've bought and does the same thing

Old Geezer

iTrader: (3)

How was it "tuned" w/ a 100psi of fuel pressure?