2 - Fuel System Pressure Test

This test will determine whether there is adequate fuel pressure delivered to the fuel injectors to start and run the engine under low load conditions.

CAUTION:
^ DO NOT ALLOW SMOKING OR THE USE OF OPEN FLAMES IN THE AREA WHERE WORK ON THE FUEL SYSTEM IS TAKING PLACE. ANYTIME WORK IS BEING DONE ON THE FUEL SYSTEM, DISCONNECT THE NEGATIVE BATTERY CABLE, EXCEPT FOR THOSE TESTS WHERE BATTERY VOLTAGE IS REQUIRED.
^ WHENEVER FUEL LINE FITTINGS ARE LOOSENED OR REMOVED, WRAP A SHOP CLOTH AROUND THE FITTING AND HAVE AN APPROVED CONTAINER AVAILABLE TO COLLECT ANY FUEL.

IMPORTANT: Battery must be at a minimum of 12 volts when performing any fuel system test. Charge battery before proceeding if below 12 volts




1. Relieve fuel system pressure. (Refer to "Fuel System Pressure Relief".) Service and Repair

Regulated Fuel System Pressure (Bat. Voltage - MIN 12 Volts):

2. Connect fuel gauge pressure adapter (309725) and pressure gauge to fuel pressure test port.
3. Using a Scan Tool, energize the fuel pump for a minimum of 10 seconds. (Refer to "Energizing the Fuel Pump" procedure.) Procedures
3.1 Record the fuel pressure.
3.2 Repeat this procedure a minimum of two times.
4. Compare the pressure recorded to the published specification.
5. Return to "Fuel System Diagnosis - Fuel Supply Chart" and use test result to make appropriate decision.