Does the Lift Pump only work when you start your car or is it in full effect for the entire drive. What does the Lift pump exactly do? Car is a Chevy Silverado Duramax Diesel 2003
There is no lift pump for a duramax. If you have two tanks,it is called a transfer pump. It is mounted on the frame between the 2 tanks to transfer fuel from the rear tank to the front. In the older trucks with the 6.5L diesel,they had a lift pump on the frame to pull fuel from the fuel tank to the engine and only produced a maximum of 6 psi. The duramax has a pump on the rear side of the injection pump that draws fuel all the way from the tank to supply the injection pump.
