Fuel Lift Pump Kit

Choosing A Diesel Fuel Lift Pump Kit

A diesel fuel lift pump kit must match the engine's fuel system and the way its lines and wiring connect. Available pump systems differ in flow rating and included components. Identify whether the repair calls for a lift pump assembly or a fuel-line service kit, then match the engine application and the connections required by that system.

What A Diesel Lift Pump Does

The lift pump moves diesel fuel from the tank through the supply side of the system. Depending on the engine's layout, a filter and other components sit along that path before fuel reaches the injection equipment.

On a system with a separate high-pressure pump, the lift pump supplies the low-pressure side. The injection pump then raises pressure for injection. These components do different jobs, so a fuel-supply problem requires checking the circuit where the restriction or pressure loss occurs.

What Is Included In A Lift Pump Kit?

Kit contents are part of the selection. Some A-Premium pump systems list a pump, fuel lines, a regulator, a bracket and a wiring harness. A separate regulated return-line kit has a different parts list and should not be assumed to contain a lift pump.

Check the inlet and outlet connections, hose routing, electrical connections and mounting location against the system being serviced. Fuel filters, fittings and hardware are supplied according to the individual package, so identify the items the repair still needs.

Hard Starting And Low Fuel Supply

Hard starting, hesitation or a loss of power can accompany a fuel-delivery problem, but those symptoms do not identify the lift pump on their own. Restrictions, air entering a line or an electrical supply fault can also affect delivery.

A pressure or flow check performed according to the engine's service procedure helps locate the problem. Diesel injection systems can operate at high pressure; use the prescribed equipment and service procedures rather than loosening a fuel connection to test it.

Frequently Asked Questions (FAQ)