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Diagnostic Aids

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Purpose of this test is to see if fuel system is getting sufficient clean fuel to start and run engine.

  1. Connect a hose to fuel drain line at bottom of fuel filter housing. Place other end of hose into a suitable container. Open fuel drain. Crank engine and observe fuel. Fuel flow should be a steady stream.
  2. Check WATER IN FUEL warning light indicator. If warning light is on, fuel is contaminated with water. Service fuel system as necessary. If engine oil is present in fuel, injector "O" ring(s) may be defective. Perform INJECTION CONTROL PRESSURE TESTS . Repair oil leaks as necessary.
NOTE: Some sediment and water may be present in fuel sample if fuel filter has not been serviced for a prolonged period of time. A second sample may be necessary to determine fuel quality.
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