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On John Deere high-pressure common-rail (HPCR) fuel injection systems, why is the timing of the high-pressure fuel pump (relative to engine timing) critical?

A. Pumping events are synchronized with injection events to minimize pressure spikes in the fuel rail.
B. An improperly timed HP fuel pump could lead to fuel being pumped back into the low-pressure fuel system.
C. An improperly timed fuel pump may lead to improper camshaft timing.
D. Pumping events are timed opposite of injection events to minimize pressure spikes in the fuel rail.

Answer :

Final answer:

The timing of the high-pressure fuel pump is critical to ensure proper fuel delivery and minimize pressure spikes in the fuel rail in John Deere HPCR fuel injection systems.


Explanation:

The timing of the high-pressure fuel pump in John Deere high-pressure common-rail (HPCR) fuel injection systems is critical because it needs to be synchronized with injection events to minimize pressure spikes in the fuel rail. Pumping events occur at the precise timing to ensure proper fuel delivery to the injectors. If the fuel pump is improperly timed, it can lead to fuel being pumped back into the low-pressure fuel system or result in improper camshaft timing.


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