How should the technician test the high-pressure system pressure in the high-pressure fuel injection system?

A. The technician should hook up a gauge to the high-pressure fuel line.
B. The technician should use a scan tool to measure system pressure from the rail fuel pressure sensor.
C. The high-pressure fuel system doesn't need to be evaluated, as long as the high-pressure injection pump is operating properly.
D. The high-pressure fuel system pressure cannot be monitored because of the potential for injury.

To test the high-pressure fuel injection system, the technician should hook up a gauge to the high-pressure fuel line for accurate measurement. Using a scan tool can also provide readings but is not as thorough as a physical gauge. Proper evaluation of the high-pressure system is critical to ensure functionality regardless of the pump's operation.

Explanation:

Testing the High-Pressure Fuel Injection System

To effectively test the high-pressure fuel injection system, the technician should choose method (a) - hooking up a gauge to the high-pressure fuel line. This approach allows for a direct measurement of the fuel pressure, ensuring accuracy and reliability in diagnosing potential issues. Having a pressure gauge appropriately rated for the expected pressure is crucial, as it should be able to measure at least twice the anticipated maximum pressure for accurate results.

Alternatively, method (b) - using a scan tool to measure system pressure from the rail fuel pressure sensor - can provide an easy way to read pressure values electronically, but relying solely on this method may overlook certain types of failures that could be assessed with a physical gauge connected to the system. Method (c) is incorrect because even if the high-pressure injection pump appears to be functioning, evaluating the pressure is still necessary for overall system performance. Finally, method (d) incorrectly suggests avoiding pressure monitoring due to safety concerns; while caution is required, proper testing procedures in automotive engineering are established to mitigate these risks.

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