Wiring connections also should be cleaned and inspected to assure good electrical contact. The gasket or O-ring seal should always be replaced when changing the pump, along with the filter sock on the pump inlet.
The fuel pump module is held in place with fasteners or a lock ring on top of the fuel tank, which requires dropping the tank if the pump needs to be replaced. The fuel filter also may be part of the module. On vehicles with “returnless” EFI systems, the pressure regulator also is part of the module assembly. Most fuel pumps are located inside the fuel tank, and are part of a module assembly that includes the fuel level sending unit and float. A good pump also can’t deliver normal fuel pressure if pressure regulator has failed, the fuel filter is clogged or the fuel line has a restriction. The pump is still good but is not working because it is not receiving voltage because of a bad relay, fuse or wiring problem. Many so-called pump failures are also misdiagnosed.
Fuel pump failures often occur without warning. Fuel pump failures can be caused by electrical faults, old age (wear) or fuel contaminants (dirt, moisture or bad gas).
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