Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1998-03-11
1999-11-02
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123520, F02M 3704
Patent
active
059750626
ABSTRACT:
A method and apparatus for periodically air-washing a charcoal canister and for testing leak-tightness of a closed fuel supply system of an internal combustion engine in which a reversible electric air pump is installed in a line connecting the fuel system and the canister to the intake manifold of the engine upstream of the choke valve. In one direction of operation of the pump, ambient air is sucked through the canister and fed to the intake manifold to wash the canister and in the other direction of operation of the pump, air is pumped from above the choke valve in the intake manifold to the fuel system to pressurize the system to check leak-tightness thereof. When the engine is turned off, the pump is shut off and the fuel supply system is connected to the canister.
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Bonse Michael
Van De Venne Gunter
Moulis Thomas N.
Pierburg AG
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