Porsche 1972 911 Workshop Manual page 159

Beginning with the January 1973 production, Type 911 T vehicles are equipped with the continuous
injection system (CIS).
T h e working principle of this system depends on measuring the intake air flow rate to determine the
amount of fuel to b e injected.
The fuel distributor determines the quantity of fuel to be delivered depending on air flow rate and
engine loading conditions.
C O N T I N U O U S I N J E C T I O N S Y S T E M ( C I S )
D e s c r i p t i o n