Troubleshooting Strategy

FUEL SUPPLY DIAGNOSTIC TROUBLESHOOTING STRATEGY

Use these steps to plan your diagnostic strategy. If you follow them carefully, you will be sure to find most of the fuel supply faults.
1. Gather information from the customer. Engine malfunctions caused by insufficient fuel supply and evaporative emission system operation malfunctions can be caused by faults in the vapor line, fuel pipe, hose, or fuel tank pressure control valve, etc.
2. Verify that the condition described by the customer exists.
3. Find the malfunction by the Symptom Procedure.
4. Verify malfunction is eliminated.