Question about 1999 Chevrolet Silverado 1500

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Need assistance on a 1999 silverado 5.3 fuel pump. The new fuel pump is an upgraded flat four prong connector. I have the new wiring diagram but not the old one. I connected black to black gray to gray purple to purple orange/black to black and white the fuel pump did not operate, is this the correct sequence?

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  • Jeremy W.
    Jeremy W. Dec 29, 2010

    I don't see a white/black wire on the diagrams?

    Is it possible for you to post a picture?

    There should be power on the grey for 5 seconds when the key is turned to the run position and power all the time when the key is in the crank position. This is power to the pump.

    The black wire is pump ground. Make sure the ground is good.

    Do you have a test light or a volt meter?

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