1. Meter quantity of fuel as per speed and loads. 2. Distribute the metered fuel equally among the cylinders. 3. Inject the fuel as the correct time in the cycle. 4. Inject the fuel at the correct rate. 5. Inject the fuel with required spray pattern and atomization demand by the combustion chamber. 6. Begin and end injection sharply without dribbling of after injection. To fullfill the all requirement the injection system consist of 1. Pumping elements. 2. Metering elements. 3. Metering controls. 4. Distribution element. 5. Timing control.
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