The fuel-injection system of any diesel engine has six basic functions:
1. To store, clean, and transfer fuel
2. To meter the quantity of fuel required at all loads and speeds and to equalize the fuel quantity delivered to each engine cylinder to ensure equal power between cylinders of multiple-cylinder engines.
3. To start injection at the right time within the cycle of the engine in relation to load and speed
4. To ensure quick beginning and ending of injection so that the injected fuel is evenly atomized
5. To inject the fuel at the rate necessary to control both combustion and pressure in the cylinder
6. To direct, distribute, and atomize the fuel uniformly, as required by the 3-8
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