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Fuel Pump

thirdgoat

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thirdgoat Enthusiast

thirdgoat

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Posted

I have a 5.7 99 Tahoe 2-door I just purchased. The fuel pump had a pretty loud high-pitched whine, so I ordered a replacement new GM pump. Anyway, I was planning on replacing this at a shop on post, but my truck just now started to have idling problems, barely started, and now does not start at all. I still hear a whine at the rear from the pump, but don't know any more than that.

Now here is the weird part, coincidence? I was installing a cell phone car kit to use my cell phone off the truck power. I found power at a panel on the firewall, basically behind the parking brake assembly. I was testing out the phone, it worked fine, the truck seemed to be running just fine as well, but upon trying to restart, that's when the problems arose.

I have found the fuel pressure valve under the cover in the engine compartment, and it looks similar to a tire valve. Can I test for pressure there?

 

Thanks in advance for any help!!

John

thirdgoat Enthusiast

thirdgoat

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Posted

I was able to start it again, the pump is very noisy, and when turning the ignition on, the pump starts and then there is another higher pitched squeal for about 3-4 seconds, then goes away. Obviously I will replace it, but has this happened to anyone else, or did they just "die"

Thanks!

mcreyaufmiller Senior Enthusiast

mcreyaufmiller

Posted
Posted
I have a 5.7 99 Tahoe 2-door I just purchased. The fuel pump had a pretty loud high-pitched whine, so I ordered a replacement new GM pump.  Anyway, I was planning on replacing this at a shop on post, but my truck just now started to have idling problems, barely started, and now does not start at all. I still hear a whine at the rear from the pump, but don't know any more than that.

Now here is the weird part, coincidence? I was installing a cell phone car kit to use my cell phone off the truck power. I found power at a panel on the firewall, basically behind the parking brake assembly. I was testing out the phone, it worked fine, the truck seemed to be running just fine as well, but upon trying to restart, that's when the problems arose.

I have found the fuel pressure valve under the cover in the engine compartment, and it looks similar to a tire valve. Can I test for pressure there?

 

Thanks in advance for any help!!

John

 

 

 

John,

 

The GM fuel pumps are noisy naturally. I would not worry to much about that. As long as you hear the noise, you know the pump is working.

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