AIR-ASSISTED FUEL EVACUATION SYSTEM

摘要

A system and method are provided for evacuating fuel from a closed-loop fuel rail after engine testing. The method includes coupling a coaxial hose to a closed-loop fuel rail of an engine. The coaxial hose defines an outer tube section defining an outer passage and surrounding an inner tube section defining an inner passage, and a portion of the inner tube section is inserted a predetermined distance into the fuel rail. The method includes transferring fuel from a fuel supply through the outer passage of the coaxial hose and into the fuel rail for use during an engine testing procedure. After the engine testing procedure is complete, the method includes injecting compressed gas through the inner passage and into the fuel rail, creating a positive pressure. Residual fuel is evacuated from the fuel rail out through the outer passage of the coaxial hose.

主权项

1. A system for evacuating residual fuel from a fuel rail of an engine, the system comprising:
a source of compressed gas; a coaxial hose including an outer tube section defining an outer passage in fluid communication with a fuel supply and an inner tube section defining an inner passage in fluid communication with the source of compressed gas; a coupling member disposed at a first end of the coaxial hose for removably coupling the coaxial hose to the fuel rail; and a valve assembly disposed at a second end of the coaxial hose and configured to provide:
selective fluid communication between the outer passage and a fuel supply to transfer fuel to the fuel rail for engine testing; andselective fluid communication between the inner passage and the source of compressed gas for pressurizing the fuel rail and evacuating residual fuel back through the outer passage upon completion of the engine testing.