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Diesel fuel pumps are designed to inject a specific amount of fuel at
a very specific time. They control the injectors by the pressure
waves of the fuel that they pump. They are usually linked to the
crankshaft or the camshaft through a series of gears. These gears
allow the fuel pump to be driven directly by the crankshaft of the
engine. However, some are belt driven and some are chain driven. The
diesel fuel pump has mechanisms in it which allows more or less fuel
to be pumped. If less fuel is pumped into the cylinders, this slows
the engine. Pumping more fuel increases the speed of the engine.
Consequently, the fuel pump regulates the speed of the diesel engine.
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