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Submitted by Chaske83 on July 7, 2021
Question

The power to the fuel pump is only 4.3volts. What is the reason for low power?

Vehicle
Odometer
160000

Answers

Hi, thanks for visiting youcanic. Without knowing the year model, I could only think of two suspects for your trouble. Your car could have a faulty fuel pump relay, or due to the car's age, there could be some corrosion on the wiring to the pump or from the mains to the fuel pump relay. I would suggest checking the voltage on the contact side of the relay. If the voltage from the side going to the fuel pump is low, but the voltage to the relay is good,  then you should replace the relay.