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Discussion Starter · #1 · (Edited)
Sorry! I'm not very good at English.
I have a problem, periodically turn on the lamp "check fuel cap".
fuel cap-normal.
What reasons can lead to the inclusion of this warning light?
Sincerely SERGE13
Ford Explorer 4.0L XLT 2000
 

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The fuel system is closed to prevent gas fumes from escape to atmosphere.
They are stored in a "charcoal cannister".
The computer opens a valve periodically to draw fumes into the engine.
Any leak in the system or an inoperative purge valve will trigger this.
The gas cap can leak, but the hoses and charcoal cannister may also leak.
 

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Discussion Starter · #3 ·
Thanks G O R T!
It may well be somewhere there is a leakage of fuel vapors or loss of vacuum fuel sistemy.No I do not feel the smell topliva.I traces of fuel leaks from pipelines, I do not find.
Where is the coal canister?
Sincerely SERGE13.
 

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On trucks it is often under the bed, perhaps above the spare tire or fuel tank. They are plastic now. The purge valve is usually attached to the front inner fender and can be under the battery. There is an Vapor Pressure Sensor in the fuel tank also. It can get tricky to check its operation so I hope you just find a leak.
 

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Discussion Starter · #5 ·
Thanks G O R T!
I found a canister of fuel vapors. she is over the mechanism for lifting the spare wheel. "Charcoal cannister" in good condition.
I will look for leakage of the vacuum.
Sincerely SERGE13.
 

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Discussion Starter · #6 ·
Thank you all.
Signal "check fuel cap" No!
I had a bad fuel cap
The fuel tank is not a vacuum.
Now all O. K.
 
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