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George H.
George H., ASE Certified Technician
Category: Chevy
Satisfied Customers: 18394
Experience:  GM Tech ASE Master Tech 15+ years
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The purple wire from the powertrain module to the fuel pump

Customer Question

The purple wire from the powertrain module to the fuel pump relay is it a hot wire or a ground wire?
Submitted: 1 year ago.
Category: Chevy
Expert:  George H. replied 1 year ago.

Hello I will help you with your question,

The purple wire at the pump connector is for the level sensor and only connects the resistor in the sender to the engine computer. The grey wire powers the pump and should go to 12 volts when you first turn the key on to prime the pump and will stay hot if the engine computer is happy with the security setting of the key and security module.

Please let me know how I can help

Thank you

Customer: replied 1 year ago.
What do you mean by security setting
Expert:  George H. replied 1 year ago.

The engine computer has to get the correct signal from the key and security module to run the fuel pump. You should still see the pump get 12 volts on the grey wire each time you turn the key on but the purple wire you asked about has nothing to do with the pump operation and does not run to the pump relay.

Let me know how I can help

Thank you

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