My uncle's 2500 has been eating fuel pumps every 8K miles or so. This most recent time I told him to try and check the volts going to the pump, figuring its an electrical problem. He is getting roughly 8.25, the mechanics I work for say normal voltage should be between 12 and 14, however another mechanic told him 8 is the normal voltage. Can anyone confirm which is right, and also if anyone else has had this problem, how did you fix it?

My uncle's 2500 has been eating fuel pumps every 8K miles or so. This most recent time I told him to try and check the volts going to the pump, figuring its an electrical problem. He is getting roughly 8.25, the mechanics I work for say normal voltage should be between 12 and 14, however another mechanic told him 8 is the normal voltage. Can anyone confirm which is right, and also if anyone else has had this problem, how did you fix it?

Normal is battery voltage not 8.25. You need to see what the voltage is at the relay. There is also a fusible link as well that needs to be checked.

//2000CAYukon

I should have said the voltage going to the fuel pump(connector for power to the pump)

I should have said the voltage going to the fuel pump(connector for power to the pump)

Voltage at the connector should be 12-14. The ground for the fuel pump is on the frame rail near the tank. Make sure the connection is clean and tight.

//2000CAYukon

Make sure to check the relay open the relay centre on the driver side under the hood find the fuel pump relay remove it and switch it with a 4 pronge relay(instead of the 5 pronge that you pulled out) turn the key to on and listen for the pump if it doesn't work try with another relay