Question about 1990 Chevrolet Caprice

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Where is the pcm on a 1990 chevy caprice, my chevy takes a long time to start the fuel pump ant priming and i just put it in i had to run wires from the relay to the pump and it won't prime but starts up after a while when the fuel reaches the motor

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Have you cheked your fuel filter

Posted on Jul 19, 2009

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2 Answers

Put new fuel pump in 2010 chevy express 3/4 ton van have no power to fuse its grounded on both sides only one power to fuel pump relay


I don't know liter size of engine? The relay has two sides, the load side and the control side. The load side, looks like open switch, left side. Terminal 87 is hot all the time. The right side of relay is control side, needs voltage and ground. On the control side, dark green wire with white tracer is voltage, comes from pcm. The black wire is chassis ground.
Are you missing anything else? Engine cranking, you have spark at the plugs where applicable, and fuel injector pulse? With engine cranking, if your missing everything, I'd have to check rpm signal.
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Jul 07, 2017 | Cars & Trucks

1 Answer

Fuel pump won't cycle when the key is turned on 93 Chevy astronaut 4.3 eng


For initial prime, you have to check fuel pump relay and wiring circuits. The control/coil side of relay gets voltage from pcm, green wire with white tracer. The ground for control side of relay, should be a chassis ground. Voltage for load side of relay is fuse protected.
This vehicle has an oil pressure switch in fuel pump circuit, just a redundant power supply to the fuel pump. Even w/o the relay the vehicle should start and run, once the oil pressure builds up and that switch closes, the fuel pump will get voltage. There won't be any initial prime w/o the relay.
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Nov 10, 2016 | 1993 Chevrolet Astro

2 Answers

When i turn the key the engine cranks over but does not start, if i continue to crank it for a minute or two then it will eventually start and drive just fine. any ideas?


This sounds like a fuel system priming issue. When you first turn the key to the ON position (not cranking yet), you should hear a three-to-five second buzzing noise. This is the fuel pump running to pressurize the fuel system for cranking. This is controlled by the PCM and is relay activated. Once the vehicle starts and oil pressure rises, then the fuel pump is activated by the PCM via a different relay. If you can't start at first, what is probably happening is that the prime is not occurring and you have to crank it until the PCM sees oil pressure and then fires off the fuel pump. It could be PCM wiring or a bad fuel pump prime relay.

Oct 02, 2015 | Cars & Trucks

1 Answer

When my fuel pump didn't turn on, my truck wouldn't start, if it did turn on it started right up. I replaced the fuel pump and it starts every time, but the fuel pump doesn't turn on every time. Is...


the fuel pump don't turn on every time . first when the pump as prime or if system is prime the pump will not turn on
the PCM give a ground to fuel pump relay for 2 sec and while the engine is cranking the pump is running all the time.
but pcm don't prime each time

Oct 10, 2013 | 1998 Chevrolet K1500

1 Answer

Does a chevy cavalier 2.0 fuel pump put out same pressure as 1998 dodge neon 2.0 dohc?


if its a racing fuel pump than it will have more BUT that will do you no good if you dont have racing fuel injectors, fuel rail, bigger intake manifold, bigger throtle body, and your mapping tuned in with a flashable pcm$$$$$$$$$$$$. stock fuel programing will let it run stock no matter how much pressor your fuel pump puts out. fuel injectors are solenoids that the pcm opens and closes they dont stay open. BUT IT WILL WORK

Mar 16, 2012 | Dodge Cars & Trucks

1 Answer

I HAVE A 1994 Chevy Truck G 20 Van V8-350 5.7L ...CRANK NO START I AM GETTING FUEL TO THROTTLE BODY BUT not injection into motor. being test wires all day first the fuel pump wouldn't prime so had a...


If the fuel pump does not prime either the PCM is not sending a ground signal to the relay, the relay is bad, or there is an issue with its circuit (no power to relay/blown fuse, short in wires).
Your injectors not spraying may be the ignition module. The module sends a signal to the PCM to let the PCM know the engine is turning and running. If the PCM does not see this signal it may think the engine is not running and when it does not run it does not spray fuel.
Take the module to an autozone to have it tested.

Sep 01, 2011 | Chevrolet G20 Cars & Trucks

1 Answer

I have a 1992 chevy caprice.when car sits overnight i go to start it and it cranks over probably 7or 8 times then starts and runs good.i had a 1977 chevy with a carburator and it fired up in about 1.5 to 2...


No this is not normal at all and you have a problem. FI engines should start immediately and run great without any hesitation. It can be a partially clogged fuel filter. Replace the fuel filter ASAP. It can also be a weak fuel pump or defective fuel pressure regulator especially on a 18 year old car. Fuel pump is located on top and inside the fuel tank. The tank must be removed to replace the fuel pump. After replacing the fuel filter and fuel pressure test will tell you if the pump is going bad.

Jul 19, 2010 | 1992 Chevrolet Caprice

1 Answer

I have a 1992 Lincoln Mark vii lsc. Fuel pump problem!


This sounds like the PCM has taken a turn for the worst. The pcm relay sends power to the fuel relay for 2 seconds to prime the fuel system just before start up.
Then the pcm ungrouds the signal for a prove out.

Oct 22, 2009 | 1990 Lincoln Mark VII

1 Answer

Fuel pump not pumping


your fuel filter is probably plugged up which is what probably caused the pump to go initially. after the fuel is out of the lines the first start will take a while.

May 12, 2009 | Chevrolet 1500 Cars & Trucks

4 Answers

1995 chevy caprice classic


Also do not let tank run low because fuel in tank keeps in tank pump cool. This is why the pump is in the tank.

Jul 07, 2008 | 1995 Chevrolet Caprice Classic

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