Evaporative system leak detection upon refueling

Details Evaporative system leak detection upon refueling Evaporative system leak detection upon refueling

2007-04-17

2007-04-17

Wolfe, Jr., Willis R. (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S1980DA, C073S049700, C073S118040, C701S031000, C701S036000

Reexamination Certificate

active

11100848

ABSTRACT:
A loose or missing fuel cap detection method for an evaporative emission control system of an automotive vehicle detects a loose or missing fuel cap based in part on whether fuel level changed. The method determines whether the fuel level changed, which is indicative of a refueling event. The method then determines if one or more leaks are present. If the fuel level changed and one or more leaks are present, the method determines that the fuel cap is loose or missing.

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