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  1. #1

    Default '99 CK Fuel Pump / Filter problem...

    105 actual miles, babied 1999 5.7 4WD. 1500 hlf-ton.

    Coming home the other day after operating perfectly; engine just died and wouldn't restart.

    When I engage the switch, I still hear the pump buzzing.

    Blocked filter?

    Could the pump be defective and still making noises as though operating?

    Something else entirely?

    Thanks in advance,

    Pat

  2. #2

    Default

    Maybe to all three questions.

    Standard test for a blocked filter or defective pump at this point would be to test the fuel pressure. If the pressure is normal (~60 psi) and stays normal while trying to start, then a blocked filter/defective pump is not indicated.

    My '98 did something very similar once. Turns out the wires going to the CKP had come out of their harness, laid across the exhaust manifold and burnt through. Diagnosis of this condition started by pulling codes from the computer, which showed a CKP/ICM code. If the fuel pressure test seems to pass, the next thing I'd do would be to pull codes from the computer and see if there are any clues there.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

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