Trouble shooter

Motor,  Jul 2003  by Seyfert, Karl

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If you do find air, the next step is to find where it's coming from. At rest, the air migrates to the highest point in the fuel system-the fuel filter. Normally, the engine will stall after it has run for about 30 seconds until the air reaches the pump. The filter/water separator can develop fuel and air leaks at the fuel heater, restricted filter sensor, filter drain or water-in-fuel O-ring. The air bleed Shrader valve may also leak. An-other place to look for air leaks is the injector return cap O-rings and hoses. A kit is available that includes the necessary hoses and O-rings. There are several other places where air likes to crash the party. You'll have to narrow things down by tracing the complete fuel loop if any air is detected.

As you suspected, the injection pump solenoid may be faulty. Make sure it's receiving battery voltage with the ignition on and during cranking. The camshaft position sensor may also be a source of trouble, especially if the camshaft has abnormal end play. Consult your service information sources for additional information on any of the topics covered in this column.

Copyright Hearst Business Publishing Jul 2003
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