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    asp2801's Avatar
    asp2801 Posts: 3, Reputation: 1
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    #1

    Mar 27, 2010, 06:48 AM
    Are unit pump & unit injector used in modern diesel engine powered automobiles?
    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's Avatar
    cdad Posts: 12,700, Reputation: 1438
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    #2

    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.
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