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Pump. The Fuel Pump has a maximum deadheaded pressure output of approximately 9.0 kPa (130 psi). The Reg- DIAGNOSIS AND TESTING FUEL PUMP TEST FUEL PUMP PRESSURE TEST Use this test in conjunction with the Fuel Pump Capacity Test, Fuel Pressure Leak Down Test and Fuel Pump The Fuel Pump contains a one-way check valve to prevent fuel flow back into the tank and to maintain fuel supply The Fuel System is equipped with a separate Fuel Pump mounted to the chassis along side of the Fuel Filter/ WARNING: THE FUEL SYSTEM IS UNDER CONSTANT FUEL PRESSURE EVEN WITH THE ENGINE OFF. 1. Remove the protective cap and connect the 0–6.9 bar fuel pressure gauge (2) to the fuel rail service T Scan Tool, the 34.4 bar pressure trans- ducer, and the transducer-to-test port adapter 2. Start and warm engine and note pressure gauge reading. Fuel pressure should be 3.7 - 4.1 bar (54 3. If engine runs, but pressure is below 3.7 bar (54 psi), check for a kinked fuel supply line somewhere 4. If operating pressure is above 4.1 bar (60 psi), electric fuel pump is OK, but fuel filter/pressure regulator is defec- tive. Replace fuel filter/pressure regulator. Refer to Fuel Filter/Pressure Regulator removal/installation. 5. Install the protective cap to the service test port pressure fitting (1) on the fuel rail. FUEL PUMP CAPACITY TEST Before performing this test, verify fuel pump pressure. Refer to Fuel Pump Pressure Test. Use this test in 1. Release fuel system pressure. (Refer to 14 - FUEL SYSTEM/FUEL DELIVERY - STANDARD PROCEDURE). 2. Disconnect fuel supply line at fuel rail. 3. Obtain the correct Fuel Line Pressure Test Adapter Tool Hose. 4. Connect the correct Fuel Line Pressure Test Adapter Tool Hose into disconnected fuel supply line. Insert other end of Adaptor Tool Hose into a graduated container. 5. Remove the fuel tank filler cap. 6. Turn the ignition switch to the ON/RUN position. 7. A good Fuel Pump will deliver 1 liter (1.05 qt.) of fuel in a maximum of 35 seconds. ZH FUEL DELIVERY 14 - 17 |