Question about 1990 Chevrolet Corvette

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Testing fuel pump relay on a 90 corvette

How do i check to see if the relay is working it is my understanding that on a 90 vette the car will run on limp mode if pump relay fails

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When you turn the key into the on position not starting it you should hear the pump working

Posted on Aug 26, 2009

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When you turn the key into the on position not starting it you should hear the relay click once every time you turn the key on ( located under passenger side dash, center relay of the five) if no click check the fuse (under drivers side dash by the radio). If relay don't click with good fuse its probably bad.

Posted on Sep 10, 2010

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84 Corvette crossfire engine stalls out when running and trouble restating after stalling out...fuel pump replaced five times along with fuel filter and fuel pump filter...car sitting since 2008 and...


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The only part that would come to mind after all of this would be the fuel pump relay. This is located on the fire wall on the drivers side of the car. When that goes bad it does not allow for adequate fuel to cycle through.The other thing would be timing. You need fuel air and spark for the vehicle to fire. After all the test and after replacing the fuel pump relay. I would do a compression and a leak down test. Are you sure that the timing did not jump a gear? You can also look and test the IAC (Idle Air Control) or the MAF (Mass Air Flow Sensor). Also do a test to check fuel pressure. The last Corvette that I worked on personally that had this issue it turned out to be the Fuel Pump Relay. Good luck let me know if you have any further questions.

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When was the last tune up? What was changed? Coils are notorious for a non running condition. Dead cell in battery or loose battery connections can make it stall. Bad alternator also. Bad fuel filter or fuel pump. Any of these are places to start checking.

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CHECK FUEL PUMP RELAY. TRY STARTING FLUID .IF THAT DONT MAKE IT FIRE YOU HAVE NO SPARK

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It sounds to me as though you have a clogged or malfunctioning fuel pump. Depending on the engine in your car, and whether or not the engine has a carb or fuel injection system.

In most of the early 90's corvette's, there should still be a fuel filter on the fuel injection throttle body (it looks like a carb), and a fuel filter under the car on the fuel lines. I believe you'll want to check the passenger side, but follow the fuel lines to find the filter. You might only have one under the car, so don't be alarmed if you don't find a small one on the throttle body.

Try changing your fuel filters first, as this is an inexpensive way to make sure your vette is in optimum condition before you do anything else.

If fuel filter replacement doesn't work, you will want to have your fuel pump tested. The only way to DIY, is to remove the fuel pump from the lower drivers side of the engine and to blow in the "in" side with a little water and see if it puts out the fluid. Even at that it could still be bad, so if you pull the pump, plan on replacing it.

The only other realistic option is that your fuel injectors are dirty or the gaskets are bad and it is time for an injector overhaul. This is not to hard to DIY, but does take patience and attention. You can also try running some fuel injection cleaner through your engine before trying anything else to see if it helps.

Some unlikely options are that your smog pump is clogged, your catalytic converter might be bad, you EGR valve or Purge Valve is clogged, your timing is off and you need to check the spark system, or that you could have low compression.

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I had the same problem. Turns out,( and I didn't believe it when I was told) but, my problem turned out to be cheap (inferiour) plugs and wired. I was reccomended to use NKG plugs and Borg-Warner wires.

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