Classic Spectra symptoms. 
70 cutlass ls3 swap fueling problem
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.
Most likely your fuel setup is all and good.. but what you need to do is monitor the fuel pressure at the Fuel Rail..
Also.. connect a scanner and monitor it real time or log the inputs from the sensors.
BC
Also.. connect a scanner and monitor it real time or log the inputs from the sensors.
BC
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its a spectra but i changed the pump to a 255lph. i am thinking of getting the e85 high flow/pressure pump for 09 and newer chev trucks off ebay. can someone recommend a better one. will the 05 gto pump work better?
I think the Spectra tank is a baffeling problem, not a fuel pump problem. You'll need to put a gauge on it to see if you're actually loosing pressure when it cuts out. If it is, you don't have a good baffle in the tank and the fuel is running away from the pump.
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.
i checked the fuel pressure while driving. fuel pressure remain at 58lbs and did the same thing. fuel pressure never dropped or fluttered. could it possibly be the ecm. i did not do the programming.
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.
