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I put a new fuel pump and filter in my 99 chevy truck and it starts up for a couple of seconds and dies

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  • Chevrolet Master
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Make sure the security is not triggered. Is the light flashing? It is on if flashing when you are trying to start the truck.
Maybe your pump is not on? Sure way to tell is to put a fuel pressure gauge onto the test port on the fuel rail, then turn the key to on. Don't know your specs , but probably around 45-50 LBS of pressure. Do you hear the fuel pump turn on for 2 seconds when turning the key to on? If not, and you have no fuel pressure, you need to investigate the fuel pump wiring. Also there is a fuse for the pump, probably in the Power Distribution Center (the relay and fuse block) under the hood.

Posted on Dec 17, 2016

  • jeffrey tadjiki Dec 17, 2016

    1- you should test the old pump and wiring frist

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My '99 chevy truck with 5,7L 350 will start but wont stay running. put new fuel pump and relay switch in


First you must determine if the fuel is stopping or the spark is stopping..If the fuel is stopping this could be a computer problem.. If the spark is stopping then it could be the IGN Module in the distributer. or any nomber of sensors. Squirt a little fuel directly into the Throttle body on the intake manifold.. If the truck runs longer its probably loss of fuel.. Do this several times to make sure, be careful and only use a small amounty of fuel.. you do not want a fire.. RE: Spark: Take a plug wire and an old plug..put the wire on the plug.. hold the plug against a good ground .. have someone crank the engine .. does the plug stop firing? The engine dies.. and will not restart for a minuet or so.. during this "no start" time do the plug test. If the plug will not fire during this time take the module out and take it to Orillys Auto parts.. They can test it.. really expensive part. Don't replace until you know it is BAD..

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It sounds like the fuel pressure check valve on the fuel pump has gone bad and your losing fuel pressure when engine is turned off. Try priming the fuel pressure twice, that's when you turn the ignition keys to the run position with out starting the engine for 10 seconds and then turning the key's to the off position and on again for 5 seconds. After the second prim the engine should start, to check this you can lone out a fuel pressure gauge and check the fuel pressure at the shredder valve. You should have 62 to 65 PSI during prim and once the engine is running, it should drop by 5 psi. As for your the accuracy on reading the right amount of fuel in your gas tank, the sensor is apart of the fuel pump sending unit and the float may have gotten bent and nothing you can do to fix it unless you take the fuel pump out again and replace the sending unit. Good luck and keep me posted.

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sounds like the fuel pump has failed, this is a common fault on this year, also the fuel pump connector is a problem at the gas tank, the new pump will come with a new connector, make sure you splice on the new connector, use a pair of wire crimp pliers and do it right or the problem will occur again.

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Before you replace the fuel pump, I would check the cheaiper parts first. Such as fuel filter and injectors.

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If it is fuel injected it will get enough fuel to start but not stay running. I had the same problem with my S10. Turns out the hose that went on to the end of the fuel pump was roted. pull the sending unit and check the hose connections to the pump and the sending unit. If problem presists replace filter first the pump.

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