Fuel line check valve system for relief of diurnal pressure

Details Fuel line check valve system for relief of diurnal pressure Fuel line check valve system for relief of diurnal pressure

2007-05-23

2008-11-04

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

C123S510000, C137S517000, C137S115200

Reexamination Certificate

active

07444995

ABSTRACT:
Prior art fuel line check valves remain closed after engine off and cool down. Diurnal heating and the resultant pressure increase in the fuel line causes fuel vapor emissions through small openings in the fuel line (e.g., at the injector tips). The invention provides a check valve for a vehicle fuel line which opens in response to engine cooling and remains open while the engine is off to relieve subsequent increasing pressure in the fuel line due to diurnal heating thereof.

REFERENCES:
patent: 3664368 (1972-05-01), Sweeney
patent: 5477829 (1995-12-01), Hassinger et al.
patent: 6067963 (2000-05-01), Oi et al.
patent: 6668802 (2003-12-01), Kiowsky et al.
patent: 6988488 (2006-01-01), Pursifull et al.

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