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Start the engine. Move the cardboard over the high–pressure fuel lines and check for fuel spray onto CAUTION: The high–pressure fuel lines must be SERVICE PROCEDURES AIR BLEED PROCEDURES AIR BLEEDING AT FUEL FILTER A certain amount of air may become trapped in the fuel system when fuel system components are ser- WARNING: DO NOT BLEED AIR FROM THE FUEL Some air enters the fuel system when the fuel fil- ter or injection pump supply line is changed. This It may be necessary to manually bleed the system if: • The bowl of the fuel filter/water separator is not partially filled before installation of a new filter • The injection pump is replaced • High–pressure fuel line connections are loosened or lines replaced • Initial engine start–up or start–up after an extended period of no engine operation • Running fuel tank empty FUEL INJECTION PUMP BLEEDING (1) If the fuel injection pump has been replaced, air should be bled at the overflow valve before (a) Loosen the overflow valve (Fig. 18) at the rear of the injection pump. (b) Place a towel below the valve. Fig. 17 Typical Fuel Pressure Test at Injection Pump 1 – FITTING Fig. 18 Overflow Valve 1 – FUEL INJECTION PUMP ASSEMBLY 14 - 12 FUEL SYSTEM—3.1L DIESEL ENGINE WJ DIAGNOSIS AND TESTING (Continued) 2000 JEEP GRAND CHEROKEE |