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DIAGNOSIS AND TESTING FUEL SYSTEM SUPPLY NOTE: The gear rotor pump in the back of the high pressure pump, draws fuel from the tank, through the NOTE: There can not be any visible signs of fuel Test Set Up Assumptions for this test are that the fuel gauge is operating properly and that there is know good fuel • Disconnect the camshaft position sensor to prevent the vehicle from starting. • Remove the fuel filter outlet line and install special tool fitting #9745. • Connect vacuum and pressure gauge # 6828 to the #9745 fitting. • Re-prime the fuel system to remove all air (Refer to 14 - FUEL SYSTEM/FUEL DELIVERY - STANDARD PRO- • Restrict the inlet side of the fuel filter by clamping the inlet hose close to the filter assembly. • Crank the engine 3–4 times in 10 seconds intervals while monitoring the gauge. Results The supply pump should draw at least 3 in. of vacuum. If the supply pump was unable to reach 3 in. of If the pump was able to reach 3 in. of vacuum, continue with this test. Pressure Test This test will check the ability of the fuel system to hold pressure. • Reconnect the camshaft position sensor. • Remove the clamping pliers from the fuel inlet hose. • Pump the hand primer until 10 psi. is obtained on the pressure side of the gauge. Will the engine start ? Results If the engine starts, refer to the fuel filter restriction test (Refer to 14 - FUEL SYSTEM/FUEL DELIVERY - If you were able to obtain 10 psi. with the hand primer, refer to the Crank No Start Chart in the Diagnostics manual. 14 - 32 FUEL DELIVERY - 2.8L DIESEL KJ |