Fuel Pressure: Testing and Inspection

DIAGNOSTIC NOTE

Almost any electric fuel pump malfunction that can occur will result in a reduction of fuel flow and/or pressure. A reduction of fuel flow and/or pressure will be detected by a reduction in engine performance. This diagnostic procedure will concentrate on determining if the electric fuel pump system is operating properly. Other diagnostic procedures will cover the analysis of other malfunctions that can cause losses or reductions of engine performance.
NOTE: If no pressure is detected in fuel lines during test procedure, fuel pump should not be powered in excess of three minutes to avoid possible overheating of pump.
A separate procedure is included to test low pressure electric fuel pumps. It is only necessary to test low-pressure pumps if noise or very low flow is a problem with two-pump systems














HIGH PRESSURE TEST

Low Pressure Electric Fuel Pump:

LOW PRESSURE TEST