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Mechanical fuel injection is the oldest of the fuel injection
systems. It uses a throttle linkage and a governor. It is now used
mainly on diesel engines. Hydraulic fuel injection is used by some of
the imports. Hydraulic pressure is applied to a fuel distributor as a
switching device to route fuel to a specific injector. The fuel from
the tank is carried under pressure to the fuel injector(s) by an
electric fuel pump, which is located in or near the fuel tank. All
excess is returned to the fuel tank.
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