Question about 2000 Chevrolet Blazer

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2000 Chevy blazer this is the 2nd brand new fuel pump I've replaced in 2 weeks,It runs a hour or two, Then sitting all night won't work in the morning.Same thing the first time . I've checked fuse , relaplaced relay . new filter. What else can it be? It's a airtex pump. It came with a wiring harness adapter that you have to cut existing one and wire in.

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  • sparkle37087 Feb 13, 2009

    Can you tell me how to perform this test without having to spend and more $

  • sparkle37087 Feb 13, 2009

    The engine will not start.

  • Bruce Bracey
    Bruce Bracey May 11, 2010

    When it quits, have you had a fuel pressure test performed. We need to start there before proceeding.

    If a pressure test has been done, what are the readings.

    Let me know.

    regards

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  • Chevrolet Master
  • 1,000 Answers

Spark......EQUIPMENT NEEDED: 1) fuel pressure Gage....Advanced Auto = $45..... 2) needle nose pliers ( fuse pull )..
There is a fuel pressure access valve located on the fuel injector rail. The access port or "shraider" valve has a black or gray screw on cap. Remove the cap and you will see the valve. CAUTION: The fuel rail is under pressure....before installing the pressure gauge, relieve pressure by starting the engine and removing the fuel pump fuse from the under hood fuse box......
Once the engine quits, turn the key to the off position and safely install the pressure gauge. Put a rag around or under the access valve to catch any drizzling fuel. I always prefer to do this when the engine is cool.
Install the pressure gauge, start the engine, check for leaks and read pressure output at idle, record pressure reading.
Also, it should be checked under load but you will need another person to help.
Once you have shut the vehicle off watch the pressure gauge, it should remain steady and not leak down.
Let me know what the readings are.
Regards,

Posted on Feb 13, 2009

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