Checking Fuel Supply to InjectorsWhen troubleshooting starting problems, check to determine whether fuel is being delivered to the injectors. First check visually for fuel leaks at the injector pipe unions or around the injector pump timing plug. To test fuel delivery, slightly loosen the fuel union nut on the fuel injector pipe for No. 1 cylinder, either at the pump or at the injector. See Fig. 3-1. Crank the engine and look for signs of fuel leakage at the loosened union.
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If no fuel is observed during this test, the most likely cause is a restriction or air leak in the fuel lines between the fuel tank and the injection pump, or a clogged fuel filter. If fuel is observed but the engine still fails to start, possible causes are incorrect valve timing (see ENGINE) or incorrect injection pump timing (5.5 Injection Pump).. When finished testing, tighten the fuel union nut and torque to 25 Nm (18 ft. lb.). |
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