Question about 1990 Chevrolet Camaro

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Fuel pump ''hums'' after turning car off

My 1990 Chev Conv Camaro runs great, but occasionaly the fuel pump doesnt turn off once the car is turned off. it will hum for a while and sometimes runs the battery down.

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Sounds like the Fuel Pump Relay is going Bad. If not you may need a New Fuel Pump.

Posted on Jan 21, 2009

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Electricity is not reaching fuel pump. Wiring is fine. 1990 F350 4.9 Emgine Automatic transmission


the power relay activates the PCM, engine computer. The PCM activates the fuel pump relay that turns on the fuel pump with key ON. It runs for 5 seconds, then it shuts off, unless the engine starts. Can you hear the pump run (hum) in th fuel tank when key is turned ON?

Also, reset the inertia switch in case it tripped. Owner's manual will tell you where it is. Rest is pressing the buton.

Jul 29, 2011 | 1990 Ford F350

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20 Gmc Yukon .wil not start replaced fe pump 1yer ago .. The enine spuns strng bt it want kck over and start


check wiring connections[fuel pump] and fuel filter --quick and easy way to check pump turn key and listen for hum of pump if hum pump running /under hood check fuel pressure at fuel line test valve [shrader]or spray starter fluid if fires up u have fuel problem if not can be many reasons from egr valve ,cat conv-pcv-these are usually the ones that dont set off a code

Jul 07, 2011 | 2001 GMC Yukon XL

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My car starts and shuts off after 3-5 seconds.


with key in ON position can you hear the fuel pump humming uder the middle of car? the pump should hum for about 10 to 15 seconds,then go off and come back on when the key is turned off and then key turned back on.could possibly be a bad fuel filter, or a fuel pump going bad, it's definitly a fuel issue because it starts. try replacing the most inexpensive thing 1st. the fuel filter and then the fuel pump. hope this helps!!!

Nov 11, 2010 | 1995 Chevrolet Camaro

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I own a 1990 Jeep Cherokee Pioneer and for some reason it will not start. The fuel pump AND fuel filter are brand new but when you turn the car over it wont start. It tries to start the longer turn the key...


you have a fuel pump relay . Check to see if the fuel pump is humming when you turn key. check for proper ground for fuel pump. try spraying some carb cleaner into the intake then attempt a start. The engine will run for a few seconds, this will verify spark. corosion at the electrical connections is always a possibility. and lastly can you get the engine running by opening the throttle when starting?

Sep 05, 2010 | 1990 Jeep Cherokee Limited

1 Answer

My car turns over starts then cuts off


The fuel pump operates off two items upon starting the car. When you first turn the key to the ON position you can hear the fuel pump faintly running inside the fuel tank. If you can not hear it it seems it is working for you stated the engine starts then cuts off. That tells me the engines oil pressure switch is working the fuel pump. On the oil pressure switch this switch has a third wire which is directed to the fuel pump. When the engine reaches full oil pressure the computer shuts off the signal from the oil pressure switch and then the computer turns on the fuel pump relay which stays on until you shut the engine off. I do beleive the fuel pump relay is what you need for it is not working no longer. This will have many relays with the same part number on it. You can easily swap any relay that looks the same with the same numbers on it and try it once to see if the engine stays running.

Apr 09, 2010 | 1990 Oldsmobile Cutlass Supreme Conv

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Dont know location of fuel pump relay for 1992 camaro


This is going to sound stupid, but before you change the fuel pump relay, go back to the tank and give it a few good raps(rubber malet works great) if your pump comes on-the buzz, you need a new pump. also if after replacing the relay- if thats what you determine to be the cause and it still won't run- get your ignition module tested-it needs to send a sig to turn on the relay as a safety. oh and sorry can't tell you were the relay is.

Aug 26, 2009 | 1990 Chevrolet Camaro

1 Answer

Fuel pump


A fuel pressure gauge is the most accurate way. You can turn the key on and listen for a humming sound, that tells you the pump is running, but dosn't mean it's completely functional.

Sep 13, 2008 | 1996 Chevrolet Camaro

1 Answer

Ran fine then next day all went to /


that sounds correct and its probably electric and in the tank. turn the key to the start position then listen for a small humming noise coming from gas tank if theres no sound then thats most likely the problem.

Jun 10, 2008 | 1990 Chevrolet Corsica

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