70 cutlass ls3 swap fueling problem
#1
70 cutlass ls3 swap fueling problem
i need help with a fueling or tuning problem. 1970 cutlass with ls3/4l60 combo. all electronics came from psi except ecm. ecm has stock tune setup with nonessential stuff removed.
the car idles fine and drives fine cruising. when i floor it and rpm go up, it dies like its out of fuel. let off the gas and it starts back pulling.
i have swapped tanks to the fuel injected tank for the 70 cutlass and i am running a return style regulator set to 58lbs as recommended from psi instructions. i have -6an line from tank to regulator and -6an from regulator to rail. anybody else had a problem like this.
the car idles fine and drives fine cruising. when i floor it and rpm go up, it dies like its out of fuel. let off the gas and it starts back pulling.
i have swapped tanks to the fuel injected tank for the 70 cutlass and i am running a return style regulator set to 58lbs as recommended from psi instructions. i have -6an line from tank to regulator and -6an from regulator to rail. anybody else had a problem like this.
#6
What brand EFI tank did you switch to? Hopefully NOT Spectra.
#8
TECH Fanatic
Sounds like you are running out of fuel under load. Carbbed engines show the same symptoms. Backing out of the throttle and things get normal, not enough fuel volume.
#11
TECH Fanatic
iTrader: (23)
Well, the fuel pump is garbage as well. Mine died after a few hundred miles, as luck would have it it crapped out just after I paid for a flatbed to take my car to the tuner. Pretty awesome. Anyway, just in case anyone else sees this thread - pull that junk fuel pump out and drop a walbro or better in.
More on topic, you might consider getting a fuel pressure gauge for in the cabin anyway, with a fuel injected car it's nice info to have when troubleshooting.
More on topic, you might consider getting a fuel pressure gauge for in the cabin anyway, with a fuel injected car it's nice info to have when troubleshooting.
#13
TECH Fanatic
At what RPM does it feel like it runs out of fuel? Did your tuner remove the over rev feature in the PCM, I am pretty sure this will cut off fuel at the rev limit.
#14
is the over rev feature the same as fuel cutoff. if so fuel cutoff is set at 6100 from what i read while looking at the tune with my hptuner. i havent verified it because the ecm is not showing me rpm with the dakota digital dash. i havent drove it with the tuner hooked up yet.