Patent ID: 7587931

Claim:
Apparatus for testing fuel flow in a return or returnless fuel injection system comprising a fuel tank, at least one fuel injector for injecting fuel into an internal combustion engine, and a fuel pump for pumping fuel from the fuel tank to the at least one fuel injector, said apparatus comprising a primary flow passage having an inlet adapted for connection to said fuel injection system for receiving fuel pumped by said fuel pump, and an outlet adapted for connection to said fuel injection system for flow of fuel to said at least one fuel injector, a first device for measuring a rate of fuel flow through said primary flow passage, a second device for measuring a fuel pressure in said primary flow passage, a bypass passage downstream from said first device having an inlet adapted to communicate with said primary flow passage and an outlet for delivery of fuel to a fuel receptacle other than said fuel tank, and a bypass valve movable between a first position in which the bypass passage is closed and the primary flow passage is open whereby fuel is adapted to flow to said engine but not to said fuel receptacle and a second position in which the bypass passage is open and the primary flow passage is open whereby fuel is adapted to flow both to said engine and to said fuel receptacle, said bypass valve being movable to said first position for testing fuel flow in a return fuel injection system and to said second position for testing fuel flow in a returnless fuel injection system.