Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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
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