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-   -   Fuel Cap and EVAP system (http://www.focusfanatics.com/forum/showthread.php?t=305999)

set321go 01-07-2013 12:22 PM

Fuel Cap and EVAP system
 
Hello,

I have 2003 focus.

fuel light keeps coming on even when cap is secured. When travelling long distance I quite often get an engine light which when I check gives me vapour leak code. To me this points towards a leaky fuel cap.

How does the sensor on the fuel cap work?
Is it testing for vacuum or is it just detecting the fuel cap?
Does the fuel cap contain a valve?

Inside the filler tube for the fuel tank, the metal flap that covers the tube when no nozzle is inserted doesn't close completely would this affect the sensors operation?

thanks


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