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FUEL INJECTION

An Injection Pump is the device that pumps fuel into the cylinders of a diesel engine. Traditionally, the injection pump is driven indirectly from the crankshaft by gears, chains or a toothed belt (often the timing belt) that also drives the camshaft. It rotates at half crankshaft speed in a conventionalfour-stroke engine. Its timing is such that the fuel is injected only very slightly before top dead centreof that cylinder's compression stroke. It is also common for the pump belt on gasoline engines to be driven directly from the camshaft

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