Method and apparatus for limiting fuel leakage through injectors

Details Method and apparatus for limiting fuel leakage through injectors Method and apparatus for limiting fuel leakage through injectors

1998-05-13

1999-12-21

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Fuel injection system

F02M 4100

Patent

active

060034955

ABSTRACT:
In operation, the main pump (24) is activated and the main value (18) is opened in response to the ignition switch (28) being turned ON to pump fuel from the fuel supply tank (12) to the injectors in the injector manifold (14). During the ON condition, the return control valve (48) is closed to prevent back flow from the injector manifold (14) to the fuel tank (12). In response to the ignition switch (28) being turned to the OFF condition, the main valve (18) is closed and the main pump (24) is deactivated and, most importantly, the return control valve (48) is opened and the return pump (40) is activated to place a negative or vacuum pressure on the upstream side of the injectors to return the residual fuel therein to the fuel tank (12). This prevents the residual fuel from leaking through the injectors and into the combustion chambers of the engine (10), which, in turn, would make it difficult to immediately restart the engine (10) because of a fuel rich condition.

REFERENCES:
patent: 5074272 (1991-12-01), Bostick et al.
patent: 5159911 (1992-11-01), Williams et al.
patent: 5389245 (1995-02-01), Jaeger et al.
patent: 5408970 (1995-04-01), Burkhard et al.
patent: 5586539 (1996-12-01), Yonekawa et al.
patent: 5630399 (1997-05-01), Nomura et al.
patent: 5672051 (1997-09-01), Forgue et al.
patent: 5845623 (1998-12-01), Blizard et al.

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