On a 2002 SuperCrew above the spare tire. A black plastic cylindrical item with a wire connector to it. What is it and what does it do?

Thanks
Bob

 

If I was to guess, I'd say the charcoal canister for evaporative emissions.

 

The evap can doesn't have connectors though does it? Can you post some pics?

 

Sure I can take a picture but how do I post it here?

Thanks
Bob

 

It'll have a purge solenoid on it.

 

There's a sticky on how to post pics in Questions about This Site or it it's not there anymore then you could do a search. It's pretty simple though. Simply upload a pic online either on this site or your own then link it here.