Evaporative Control System; Crankcase Ventilation - Volvo 960 Owner's Manual

1993 Volvo 960

Evaporative control system

The car is quipped with a gas evaporative control system, which prevents gasoline fumes from being
released into the atmosphere. The system is compromised of an expansion chamber in the fuel tank, a
roll-over valve on the cross member in front of the fuel tank, and a charcoal canister with built-in
vacuum valve under the left-front wheel housing. The components are interconnected by hoses which
channel fuel vapor from the gas tank to the charcoal filter, where it is stored until the engine is started
and then drawn into the engine's fuel induction system.

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.
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