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#730100 - November 27th 2017 9:13 pm Fuel Delivery Issue Challenge  
Joined: Nov 2017
Posts: 2
Icechopper Offline
stranger
Icechopper  Offline
stranger

Joined: Nov 2017
Posts: 2
Campbell CA
I have a 92 G30 van w/5.7L and A/T with 24k miles. Started the ole heap up a couple of weeks ago and the motor shut down after after 20 seconds of so. Tried it again, same thing. I dove into the fuel pump (FP) system, replaced the fuel filter and the FP relay, same results (actually timed the 20 second run with a stop watch). I assumed the FP was failing, so I dropped the tank and replaced the FP. Fuel tank was very clean, no obvious issues with anything that I saw in there. Started the motor, off again in 20 seconds. Oil pressure switch (OPS)? Did that too. So now I have my propeller hat on with voltage meter and test light. All fuses are sound, good fuel in the tank, recent tune up, cold beer still in the refrigerator, etc... Checked voltage at the relay plug, found 12+ V to the E terminal (gray wire) once the ignition is turned on. The proper voltage stays on for 20 seconds. The engine will start and run, but only for 20 seconds.
I then jumped 12V battery to the "E" terminal, the motor starts and runs indefinitely. One more tidbit, if I jump voltage to the orange wire of the relay plug (plug A or C terminal) the engine will continue to run as well, but if i pull the OPS plug, the motor quits (affirming that the OPS is working.

I'm getting advise from the gray-haired mechanics to look at the PCM since I've replaced everything else in the system. Does anyone have any experience with this problem? I can't think of anything else but I suspect something is telling the PCM to cut power to the FP? Any thoughts?

#730103 - November 27th 2017 9:46 pm Re: Fuel Delivery Issue Challenge [Re: Icechopper]  
Joined: Nov 2013
Posts: 796
Wedgy Offline
old hand
Wedgy  Offline
old hand

Joined: Nov 2013
Posts: 796
West Texas
Hi icechopper, Welcome to the site!

Sissy used to be a failure analysis engineer. Heat and vibration are the enemy of electronic circuitry. Chevy FSM may help with diagnosis. But not the easiest thing to do, darn it. Sounds reasonable, a short in the PCM. Especially if the voltage signal to the FP relay is cutting off. Good Hunting!

#730351 - December 04th 2017 7:46 pm Re: Fuel Delivery Issue Challenge [Re: Icechopper]  
Joined: Dec 2017
Posts: 11
Jay85128 Offline
stranger
Jay85128  Offline
stranger

Joined: Dec 2017
Posts: 11
AZ
Hi, I do not reply to very many posts concerning repairs, and I am far from a professional. I certainly do not know your vehicle, but if you have a factory security system like the GM pass key system I think it is called (with the resistor chip in the key) you might want to check that system. I have read where on various systems a vehicle will start, but if it does not receive the proper signal from the key it will shut down the vehicle. I may be totally off base and I apologize if I am. I had a similar problem and thought I would share my thoughts.


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