37chief

Well-known Member
Location
California
I would like to know what a tube is for on my 02 Ford E 450 for my motorhome. This rubber tube ends next to my trans dip stick. The end has a green cap with a tire stem air valve under the cap. The other end goes to a Y connection to the back of the motor, where hoses are marked fuel. Any thoughts. I am in the process of trying to find a manual. Stan
 
Probably a test port for the evaporation emissions system that catches fuel vapor in a charcoal canister when the vehicle is "off", then purges air through the charcoal when your are driving to recover and burn the fuel.
 

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