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The fuel system of a Duramax relies on a lift pump that pushes fuel from the tank, or cell, to the front of the car at roughly 6 psi. From there, a gear-driven injection pump mounted in the lifter valley feeds the injectors by cranking up the pressure to about 26,000 psi. In addition to an aftermarket PPE lift pump, the Chevelle has a second injection pump that's driven off the crank pulley. Fast Eddie's built the custom cell.