Question about 1997 GMC Sierra

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Gas not getting to the engine. I replaced the fuel filter. I can not hear the fuel pump whine when I turn the key. I checked fuel pump relay and fuses. The problem has been developing, therefore, I had been warned. Before it went bad, it would crank after two tries. I need instructions on how to change the pump for my 1997 GMC Sierra from beginning to the end.

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The heater tap on the return end line of your injector rail.. could play a part. and all the injector fuses and relays are good too??

Posted on Sep 02, 2010


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1999 chrysler 3.5 lhs fuel not going to injectors

Then your fuel pump is not working, or your fuel filter is blocked. You will probably have to check your fuel pump circuit if you have no fuel pressure in the fuel rail, where the injectors sit. There is a fuse for the pump, usually in the under hood fuse/relay block. That is probably also where the fuel pump relay is located. You should hear or feel this relay click when the ignition key is cycled from off to on. Also, when the key is turned to on, you should hear the fuel pump in the gas tank turn on for about 2 seconds. This will put the pressure in the gas in the fuel rail, for starting the engine. If you don't hear the pump turn on for that 2 second period, it is probably a bad fuel pump. But know the fuse is good first.

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When you turn the key to on before start do you hear the fuel pump whine for a few seconds? If you hear the whine it could be fuel filter or no spark. If no whine squirt gas into throttle. Then start the car if it starts the problem is in fuel delivery (bad fuel filter, fuel pump or fuel pump fuse). If it did not start then its spark related(cam or crankshaft sensor, ignition coil)

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I can pour gas into the carburetor and car starts, run until gas is gone fom carburetor. I disconnect hose from fuel pump to carburetor and do not see gas flow. Fuel pump has been replaced. Am thinking...

I would say more than likely your problem is a clogged fuel filter or a bad fuel pump. To narrow this down, listen for the fuel pump 'priming' (making a whining noise from the gas tank) turn the key to the On position and you should hear this whining for about 3 seconds, if you can hear this the fuel pump works fine, if not it is probably time for a new one. As for the fuel filter being that it is a 1987, I would replace it even if it is not clogged, the easiest way to test if it is clogged though is to blow at through it with your mouth and if you feel any resistance then it needs replacing.

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I have a 2000 chevrolet express van sometimes it will start and run fine now it wont start at all i no its in the fuel system how do i check to see if the fuel pump is bad

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1 Answer

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first alway check the simple things first like fuses and relays then start playin with changin out parts. under the hood you sould find a fuse panel if the lid does not tell you what is what you need to look into the service manuel find the fuel pump relay and switch it with the same type relay can works some the doesn't effect the engine like a fan relay for expamle. then try to start engine when turning key to the run pos you sould hear a fant hum or whine from the pump. if thats a no go take the main fuel line off before the fuel filter and see if a good stream of fuel comes out when you turn key to run pos.if so replace fuel filter.

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1 Answer

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Unfortunatly on GM vehicles when the fuel pumps run dry they usually damage themselves. The problem you are describing sounds like a bad fuel pump. When you turn the key to the run position you should hear the pump come on for 5 seconds and then shut off. It should be a medium pitch whine but sound smooth. Unfortunatly on GM vehicles the tanks must be removed to change pumps and depending on the climate you are in could show other problems. Here in Michigan on vehicles of that age they will usually need new tanks and sending units due to rust. I get around $500 to replace a fuel pump. Of course the price goes up with the more that is needed replaced. Hope this helps

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