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View Full Version : Are unit pump & unit injector used in modern diesel engine powered automobiles?


asp2801
Mar 27, 2010, 06:48 AM
In diesel engine fuel supply systems, unit pump & unit injector are operated by camshaft & hence pressure of injected fuel depends on engine speed. Whereas, in common rail systems its independent of engine speed. Still, are unit pump & unit injector used in modern automobiles?

cdad
Mar 27, 2010, 06:56 AM
Yes. But the pump doesn't always run from the cam itself but from a gear. That is how you can adjust timing the injector pump to a rich or lean condition. By advancing or retarding timing of the pump.