900 L4-1985cc 2.0L DOHC (1986)
Fuel Tank: Description and Operation
Fuel Tank Venting and Overfill Protection
Fuel tank venting and overfill protection
When fuel is added to the tank air is evacuated partially through the breather pipe (3).
An air cushion is formed at the top of the tank when the level of fuel reaches the lower opening of the breather pipe (3), owing to the action of a
constriction (5) positioned in the breather hose (4) for the upper section of the tank. The constriction inhibits rapid changes in volume when the car is
being refuelled but does not affect gradual changes in volume occasioned by temperature variations or the movement of the car when it is being
driven.