Patent ID: 6854492

Claim:
A vapor emission control system for an engine fuel tank having a filler tube with an upper end for receiving a refueling nozzle comprising: (a) a fuel level indicator in said tank operable to provide an electrical fill limit signal indicative of a predetermined level of fuel in the tank; (b) a fill controller operable to provide an electrical shut off signal upon receipt of said electrical fill limit signal at said determined level; (c) a storage reservoir connected for receiving fuel vapor from the tank; (d) purge flow control means connected for controlling flow of vapor from said reservoir to an air inlet of the engine; (e) a flexible seal disposed in said filler tube upper end for sealing about said nozzle when same is received therein; and, (f) an electrically operated recirculation valve operatively connected for controlling vapor flow from the tank to the upper end of the fill tube and operative upon receipt of said shut-off signal for blocking all vapor flow to the upper end of the filler tube, wherein discharge from the nozzle creates a vacuum in the upper end thereby activating an automatic nozzle shut off.