Ford Repair Questions? Ask a Mechanic for Answers ASAP
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This means the system which collects the fuel tank vapors and routes it to the engine to get burned is leaking. It can be in many areas including the fuel cap or fuel filler neck or the fuel pump gasket or the EVAP hoses or canistor. You will need a scan tool and smoke maachine to command the evap open so you can add the smoke and use a light to find the smoke exiting as the source of the leak.