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2002 Volvo C70 Coupe & Convertible
oxides of nitrogen (NOx) by a threeway catalytic converter.
Crankcase ventilation
The engine is provided with positive crankcase ventilation which prevents crankcase gases from being
released into the atmosphere. Instead, the crankcase gases are admitted to the intake manifold and
cylinders.
Evaporative control system
The car is equipped with an evaporative control system which prevents gasoline vapor from being
released into the atmosphere.
The system consists of a fuel tank with filler pipe and cap, a rollover valve, a Fill Limit Vent Valve
(FLVV), vapor vent lines, a charcoal canister, a purge line, a purge control valve and engine
connections .
In addition, there is a pressure sensor connected to the fuel tank and a filter-protected Canister Close
Valve (CCV) on the atmospheric side of the canister, for system diagnosis.
The gasoline vapor is channeled through the rollover valve and the FLVV via the vapor vent lines into
the charcoal canister, where it is stored. When the engine is started, the gasoline vapor is drawn from the
charcoal canister to the engine's air intake system and into the combustion process.
NOTE:
If the fuel filler cap is not closed tightly or if the engine is running when the car is refueled, the
Malfunction Indicator Lamp may indicate a fault.
During a transitional period, a small number of service stations may still have fuel nozzles that are not
compatible with the fuel filler neck on cars equipped with the evaporative control system (ORVR)
mandated by the U.S. Environmental Protection Agency and the California Air Resources Board. If you
experience difficulties in refueling your vehicle, please ask the gas station attendant for assistance.
CAUTION:
Fuel must not be siphoned from the fuel tank. This will damage the Evaporative control system.
file:///K|/ownersdocs/2002/2002_C70/02c70c_08a.htm (7 of 8)12/30/2006 3:54:03 PM
Crankcase ventilation
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