Fuel Pump WEIRD Electrical Problem

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Jul 24, 2021 | 01:13 PM

JayinOhio

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Teching In

Joined: Jun 2018

Posts: 5

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From: Cleveland, OH

Fuel Pump WEIRD Electrical Problem

This forum helped me fix my power windows - Thanks! - so how 'bout this fuel pump not turning on in our '01 WS6?

I had a shop replace the old fuel pump. That's $1000.
Only 500 miles later, but, unfortunately, 4 years later (yes, the car sits quite a bit), pump is dead. ...or is it?

List of symptoms:
If I connect the fuel pump to the fuel pump electrical connector, it does not run. ...Not even for 4 seconds.
Voltmeter on Black (-) and Grey (+) wires at fuel pump connector gives me 12 volts for about 4 seconds when I turn the ignition ON.
Voltmeter reads zero when I turn the ignition ON if I remove either the fuel pump relay or the fuel pump fuse.
The pump runs when external 12vdc is applied to the Black (-) and Grey (+) terminals on the pump.
If I install leads between the pump and the connector so that I can read voltage while the pump is energized externally, the pump runs and the voltmeter reads 12.
If I install leads between the pump and the connector so that I can read voltage while the pump is energized from the connector (ignition ON), the pump will not run AND the voltmeter reads zero. If I then disconnect the pump, the voltmeter reads 12.

I am not a very good electrical guy, but come on... what gives?
Any help would be appreciated.

Thanks,
-J

PS - car runs on carb cleaner

The cutters are just there to keep my wires in place.

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