70 cutlass ls3 swap fueling problem
#1
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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
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What brand EFI tank did you switch to? Hopefully NOT Spectra.
#8
TECH Fanatic
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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)
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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
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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
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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.