Fuel Pump Electrical Circuit

Fuel Pump Circuit
The relay has a terminal to test the fuel pump operation which is a separate terminal located near the fusible link cluster. By applying voltage at this terminal, it can be determined if the fuel pump will operate. This terminal will also prime the fuel line to the fuel injection unit.

An inoperative fuel pump will cause a no start condition. A fuel pump which does not provide enough pressure can result' in poor performance. An inoperative fuel pump relay can result in long cranking times, particularly if the engine is cold. The fuel pump oil pressure switch will turn ON the fuel pump as soon as oil pressure reaches about 28 kPa (4 psi).

Refer to Fuel Pump Circuit Diagnosis for diagnosis of the fuel pump relay circuit. Testing and Inspection