Gasoline vapor emission control

In a gasoline vapor emission control system for use to collect gasoline vapors emitted during filling of a motor vehicle gasoline tank, said tank having a fill tube with an entrance opening, a gasoline dispensing nozzle having a spout to project into said fill tube through said entrance opening, means for sealing the spout and fill tube to substantially restrict escape of vapor to atmosphere adjacent said fill tube, a gasoline storage tank, a gasoline dispenser connected to the gasoline storage tank to receive gasoline from it, a hose connecting the dispenser to the nozzle to deliver gasoline to the nozzle, means providing a gasoline vapor return passage having an inlet end extending into the inside of the vehicle gasoline tank when the spout is inserted into the fill tube, said means being supported by said nozzle, said vapor return passage extending to and having an outlet into said gasoline storage tank whereby gasoline vapors in said vehicle tank have a flow passage to the gasoline storage tank, and fluid pressure generating and control means in said vapor return passage to assist flow of said vapors through said passage from the gasoline tank to the storage tank.