Econoline E350 1 Ton V8-5.4L Prop SOHC VIN Z (1998)
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FTP Fuel Tank Pressure
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MIL Malfunction Indicator Lamp
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NGS New Generation STAR Tester
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PID Parameter Identifier WDS Worldwide Diagnostic System
SERVICE PROCEDURE
NOTE
THIS PROCEDURE SUPERSEDES ALL OTHER PROCEDURES PUBLISHED IN SERVICE MANUALS AND TSB ARTICLES.
NOTE
MANY EVAP LEAKS ARE CAUSED BY A LOOSE OR FAULTY CAP. IF THE FUEL CAP IS SUSPECT DURING VISUAL INSPECTION,
DO NOT DISTURB THE FUEL CAP UNTIL THE DIAGNOSTIC PROCEDURE IS COMPLETE. IF THE LEAK VERIFICATION FAILS, THE
CAP CAN BE REPOSITIONED OR REPLACED AND THE TEST REPEATED. THIS ACTION WILL ISOLATE THE CAP FROM THE REST
OF THE EVAP SYSTEM AS A POTENTIAL CONCERN. IF DEBRIS ON THE SEALING SURFACE OF THE CAP APPEARS TO BE THE
SOURCE OF THE LEAK, CLEAN THE CAP AND REINSTALL.
OVERVIEW OF TEST PROCEDURES
