Volvo 780 Owner's Manual page 131

Volvo 1990 780 Model
(hydrocarbons, carbon monoxide and nitrous gases) by a 3-way catalytic converter.
CAUTION:
Vehicles with a Catalytic Converter must use unleaded fuel only. Otherwise the Catalytic Converter
will become ineffective. See "Fuel requirements".
pg. 100 Servicing (cont.)
Evaporative control system
The 780 is equipped with a gas evaporative control system, which prevents gasoline fumes from being
released into the atmosphere. The system is comprised of an expansion chamber in 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.
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