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Identify three wires going to fuel tank on 1989 convertible with throttle body fuel injection


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The 1989 convertible with the throttle body fuel injection has an in-the-tank fuel pump. I want to see if it is getting power when I crank the motor but I have to know which wire does what. Here is a photo of the modular harness plug going to the fuel tank. One wire is red and another wire is a lighter color and the third wire is too obscured with undercoating to tell what color it is.

1989_fuel_tank_harness.thumb.jpg.61297050a18cf41e0daa1c9c225ebf2c.jpg

Anyone know which wire does what?

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IF it uses the Caprice fuel pump the book says -

Pink is fuel gauge

Black or Black\White is ground

? is fuel pump. Diagram does not show color of wire.

Hey but two out of three ain't bad.

Good luck,

Jim Wood

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When you turn on the ignition, power is supplied by the fuel pump relay to the fuel pump for 2 seconds.

If the fuel pump relay is working have someone turn the key on while you test for voltage for the 2 seconds.

If the relay is bad or missing jump the relay and supply a constant voltage, but it may be hard to tell the pump from the gauge.

Good luck,

Jim Wood

Edited by IndyJimW
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I will try cleaning the undercoating off the wires and after that I will try to get a friend to help turning the key while I am under the car checking for an electrical signal. Thanks for the hints on the wire colors.

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I cleaned as much of the undercoating off the wires going to the fuel tank on the 1989 convertible so I could try to identify the wire colors.

This is what I ended up with:

1989_Fuel_tank_plug_wire_colors.thumb.jpg.35fed3520ec0c4a15adaef670ac411dd.jpg

Edited by JensenHealey
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