Sunday, October 13, 2013

How do I Determine Which Fuel Pump Is Needed for a 99 Chevrolet Silverado V6

How do I Determine Which Fuel Pump Is Needed for a 99 Chevrolet Silverado V6?

General Motors engineered the fuel system of the 1999 Chevrolet Silverado V6 4.3L with and without an evaporative emissions system monitoring system. Chevrolet designed the fuel pump as an integrated module assembly, combining the fuel pump and fuel level sensor together as a single unit. Delphi manufactures fuel pumps for General Motors. 1999 Chevrolet Silverados equipped with the evaporative emissions monitoring system also have a pressure sensor built into the fuel pump module assembly. The engine computer applies vacuum to the fuel tank and monitors the sensor to verify the tank holds the vacuum. If the tank leaks, pressure drops and the check engine light will turn on.

Instructions

    1

    Park the vehicle on a flat surface such as a driveway. Set the parking brake and remove the keys from the ignition.

    2

    Chock the front tire of the 99 Silverado with wheel chocks to prevent the vehicle from rolling.

    3

    Lift the left rear drivers side tire of the 99 Chevy with the floor jack. Place a jack stand under the axle tube for safety.

    4

    Remove the plastic lug nut covers by hand using a 3/4 inch impact socket.

    5

    Remove the lug nuts using the 1/2 inch drive impact wrench and a 13/16 inch socket. Remove the left rear tire.

    6

    Lean into the wheel well toward the front of the bed. Shine the flashlight onto the top of the fuel tank. Extend the inspection mirror to inspect the top of the fuel pump module assembly.

    The fuel pump module assembly is round where it inserts into the tank, and has three fuel lines attached to it. The fuel pump module assembly also has a square four-wire harness plugged into it to provide power to the fuel pump and to measure the fuel level.

    7

    Look for a small black sensor with a wide flat three-wire harness plugged into it. Also inspect the four-wire fuel pump harness for a tag with three prominent letters printed on it.

    Vehicles equipped with evaporative emissions monitoring have the black sensor, two wiring harnesses plugged into the fuel pump module assembly and have a code on the four-wire fuel pump harness labeled "TCF." Delphis aftermarket part number for this fuel pump module assembly is FG0053.

    Vehicles without evaporative emissions system monitoring do not have the black sensor, only have one wiring harness plugged into the fuel pump module assembly and have a code labeled on the four-wire fuel pump harness labeled "TCU." Delphis aftermarket part number for this fuel pump module assembly is FG0271.


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