Jet pump for use in vehicle fuel tank - has membrane pump operating in parallel to give full flow even when vapour is present.

摘要

Jet pump arrangement in the fuel tank of a vehicle by means of which a fuel delivery flow is achieved using the flow of excess fuel returning from the vehicle engine, having a membrane pump (7) arranged in parallel with the jet pump (2). The working membrane (8) of the membrane pump is impacted by the pressure existing between a throttle (15) and a jet pump nozzle (4) in a section (16) of the return flow pipe (3). USE/ADVANTAGE - Jet pump in vehicle fuel tank ensures full fuel delivery flow even when vapour constituents are present in return pipe.