Niether did I until now. It's basically part of the ECS and purges the bowl of excess gas fumes when the truck is OFF. Even if this thing does work it won't matter with that 20y/o loaded up charcoal canister. <img src="/forums/images/graemlins/lol.gif" alt="" />

I'm going back to AAP to get their kit. It's almost $20 cheaper than NAPA's.

Thanks for the replies guys. <img src="/forums/images/graemlins/kewl.gif" alt="" />

http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=6188811
Quote
A carburetor outer vent control device for use in a fuel system of a motor vehicle of the type including an outer vent provided in a float chamber of the carburetor, a charcoal canister and a fuel vapor line coupling the outer vent with the charcoal canister.^The carburetor outer vent control device includes a valve means provided in the fuel vapor line which is only open when an excessive amount of fuel vapor is present in the float chamber and an engine of the motor vehicle is not running.

'86 Toyo 4wd
'04 600RR