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Fuel pump:methods of quantity control

The amount of fuel injected per stroke is usually done by varying the effective plunger stroke of fuel pump                                                                                                                1. Varying the beginning of delivery- control in valve type pumps by varying the suction valve closure(sulzer)                                                                                                               
2. Varying the end of delivery - regulation of effective stroke by helical groove.                  3. varying both beginning and end of injection- vit
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