Gasoline and vapor return hose system for delivery truck

Claim 1

A volatilizable liquid fuel and vapor return hose system for delivery trucks comprising: a flexible hose having coaxially arranged fluid conducting passageways extending along substantially its full length, the inner one of said passageways provided for carrying a volatilizable liquid fuel and the outer one of said passageways carrying vapors of said fuel, a first hose coupler for one end of said hose, a second hose coupler for the other end of said hose, said first coupler comprising a transition section connectable to a fuel delivery port of the truck for connecting said inner one of said passageways to the truck's liquid fuel compartment and said outer one of said passageways to a vapor return tube of the truck connectable to said liquid fuel compartment of the truck, said second coupler comprising a storage tank entry adaptor having an entry tube for extending a predetermined distance into the storage tank and connectable to said inner one of said passageways and a vapor exhaust opening coaxially arranged adjacent said entry tube and connectable to said outer one of said passageways for exhausting vapors from said storage tank as it fills with liquid, and a pair of detachable clamping members one mounted at each end of said hose for engaging with said first coupler at one end of the hose for connecting said one of said passageways to the liquid fuel compartment of the truck and the other passageway to the vapor return tube of the truck, and the other end of said hose to said second coupler for connecting said entry tube to said one of said passageways and said vapor exhaust opening to the other of said pasageways, and means for connecting a source of air under pressure to said inner one of said passageways for clearing the passageway of fuel before disconnecting said clamping members from said first and second couplers after a fuel delivery procedure.