Question about 1999 Chevrolet Silverado 1500

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99 Yukon Starting Problem

I tried to start my engine this morning and I tried so long the battery went down. It would crank but never fired. I checked my fuses and the weird thing is that I took my fuel pump relay out and it cranked and ran for a few seconds. I put it back in and it does nothing. I don't know much about auto engines so any help here would be greatly appreciated.

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Mine does this too, If your security light flashes, it is the security switch in the ignition. The go out, and have to be replaced. What it does it think that someone is stealing your car and shuts off your fuel pump. I always get out, lock it, wait about 15 minutes, unlock it and then usually the security light stops flashing and it starts.

Posted on Sep 25, 2012

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If you turn the key to the run position and listen carefully you should hear the fuel pump come on for a few seconds. If not...it's either a bad pump and or relay. Most have a check valve up on the fuel rail of the motor that is used to check fuel pressure with a gauge. If you hear the pump running and still have a no start you need to hook a gauge to this valve to check fuel pressure. Specs for your exact vechilce can be found on-line. If pressure to low could be clogged fuel filter or pressure regulator...if to high then its the regulator. Been down this road before so I gotta say it...make sure you have fuel in the tank ;-)

Posted on Feb 18, 2009

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