In this method, the amount of fuel entering the cylinder is varied by altering the stroke of the oil pump or by passing a part of fuel which would have otherwise been injected into the engine cylinder back to the oil tank or by delaying the closing of the suction valve in the fuel pump with the help of centrifugal governor. The supply of air remains constant but the supply of fuel is varied to control the quality of charge (air–fuel mixture). This method is widely used in oil engines besides being always used on two stroke cycle engines in which the air–fuel mixture has to be admitted to the engine cylinder to drive out the burnt charge of the previous cycle
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