Town Car V8-4.6L VIN W (1997)
Evaporative Emission Valve: Description and Operation
PURPOSE
A vapor space between the fuel level and the fuel tank upper surface is combined with an orifice and float shut-off valve in the Evaporative
Emission (EVAP) valve to prevent liquid fuel from passing to the EVAP tube shut off valve and the EVAP canister. The vapor space also allows
for thermal expansion of the fuel.
OPERATION
The EVAP valve operates as follows:
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Fuel vapor in the fuel tank is vented to the EVAP canister through the EVAP valve and the fuel tank vent tube.
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The EVAP valve is mounted in a rubber grommet at a central location in the upper surface of the fuel tank.
