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Cutlass Series Includes Cutlass Ciera, Cutlass Cruiser, Cutlass Calais, Cutlass Supreme, Custom Cruiser, as well as the GM N-Body subforums.
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Old 04-04-2019, 12:31 AM   #1
brenda053
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Return or returnless style fuel system

I have a 96 Cutlass Supreme 3.1L V6 that s fuel injected with an in tank electronic fuel pump.
Can anyone tell me if it's a return style system or if it's a returnless fuel system.
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Old 04-04-2019, 09:14 AM   #2
maxwedge
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Re: Return or returnless style fuel system

It is the return type, comes off the pressure regulator.
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Old 04-04-2019, 09:37 AM   #3
Tech II
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Re: Return or returnless style fuel system

Correct....there are two lines to the fuel rail, supply and return, with the return coming from the f/p regulator like Max said...
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Old 04-04-2019, 07:56 PM   #4
brenda053
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Re: Return or returnless style fuel system

Should fuel be draining back into the tank if the switch is turned on so the fuel pump engages but did not spin the motor. Turned switch on, waited until fuel pump stopped humming, turned switch off and could hear fuel draining back into tank.

Also...had DTC codes P0102 Mat circuit low, P0122 throttle/peddle position sensor switch A low, P0171 system too lean bank 1 and P0300 random cylinder misfire.
I cleaned the maf and its cracked on the plastic side where the metal strips show in the "windows". The throttle body was also extremely dirty.
Am I correct to assume the car isn't pumping normal fuel (which causes it to drain back into tank) because the maf is bad...
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Old 04-04-2019, 08:36 PM   #5
maxwedge
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Re: Return or returnless style fuel system

maf will not cause your fuel symptoms, get a gage on it, see what pressure holds after shut down, look inside the vacuum hose for traces of fuel, also.
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