Is a lift pump the same as a fuel pump?
Is a lift pump the same as a fuel pump?
Modern fuel pumps allow automobiles to operate at higher speeds and improve fuel economy in cooperation with a fuel injection system. Lift pumps add to that system by helping raise the level of fuel into the engine block by creating suction and managing air flow.
What to do when your lift pump is not working?
1. Unplug the two wire connector for the fuel pump. 2. With a voltmeter connected to the two pins on the supply (truck) side, turn the key to crank. If you read 12V then the supply side fuse and fuel pump relay are OK. 3. Next start the engine cold.
What causes a pump to go out on a truck?
If the clicking sound starts to change pitch and get louder your pump may be on it’s way out. The truck will run with a burned out pump because the injection pump will suck fuel all the way from the fuel tank as long as the fuel line and all it’s components are air tight.
What should the pressure be on the lift pump?
If you have a pressure gauge you should get 8psi, (after the filter) which is over the 4psi minimum. In 15 seconds it should pump out about 16oz, but at least the 8oz minimum. If you get a good stream of fuel coming out of the fuel filter line which goes to the injection pump you are probably ok.
What happens when you turn off the fuel pump?
As a car sits, the fuel pressure gradually decreases and modern cars don’t run without fuel pressure. When you first turn the key on your car, the PCM immediately powers the fuel pump to pressurize the fuel system.
1. Unplug the two wire connector for the fuel pump. 2. With a voltmeter connected to the two pins on the supply (truck) side, turn the key to crank. If you read 12V then the supply side fuse and fuel pump relay are OK. 3. Next start the engine cold.
If the clicking sound starts to change pitch and get louder your pump may be on it’s way out. The truck will run with a burned out pump because the injection pump will suck fuel all the way from the fuel tank as long as the fuel line and all it’s components are air tight.
If you have a pressure gauge you should get 8psi, (after the filter) which is over the 4psi minimum. In 15 seconds it should pump out about 16oz, but at least the 8oz minimum. If you get a good stream of fuel coming out of the fuel filter line which goes to the injection pump you are probably ok.
As a car sits, the fuel pressure gradually decreases and modern cars don’t run without fuel pressure. When you first turn the key on your car, the PCM immediately powers the fuel pump to pressurize the fuel system.
