Fuel vapor leak detection system

Details Fuel vapor leak detection system Fuel vapor leak detection system

1994-03-04

1995-02-21

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302

Patent

active

053906454

ABSTRACT:
Leakage from a portion of a canister purge system which includes a fuel tank and a vapor collection canister is detected by closing off that portion and then positively pressurizing it by means of an air pump. The air that is pumped by the air pump is split into two separate paths, one to pressurize the closed-off portion of the system, and the other to flow through a known orifice. A differential flow meter compares the flow through one path with that through the other to determine if there is leakage.

REFERENCES:
patent: 5065350 (1991-11-01), Fedder
patent: 5146902 (1992-09-01), Cook et al.
patent: 5297529 (1994-03-01), Cook et al.

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