Volvo VNL Operator's Manual page 273

268 Engine Start and Operation
Fueling
Air is always present inside the fuel tanks,
entering mainly through the tank ventila-
tion. With the air being heated up and
cooled down, condensation is formed and
water is mixed in the fuel. To avoid con-
densation when the vehicle is parked for
longer periods, fill the tanks up to 95% of
capacity. Do not fill more than that, as the
fuel needs to have room for expansion dur-
ing the heat of the day.
Do not carry extra fuel containers in the
cab. Fuel containers, full or empty, may
leak, explode or give added fuel to a
fire. Failure to follow this precaution
may lead to a fire and serious personal
injury or death.
Do not smoke while fueling the vehicle.
The glow from the cigarette can ignite
the diesel fuel, causing an explosion re-
sulting in serious personal injury or
death.