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What will cause the rail pressure limiting valve to open on a "Common Rail" fuel system?

A) Low fuel pressure
B) High rail pressure
C) Faulty temperature sensor
D) Clogged air filter

Answer :

Final answer:

The rail pressure limiting valve in a Common Rail fuel system will open in response to high rail pressure to prevent system damage. The correct answer is: B) High rail pressure.

Explanation:

In a Common Rail fuel system, the rail pressure limiting valve is designed to open when a certain condition is met to prevent damage to the system. This condition is B) High rail pressure. When the pressure in the common rail fuel system exceeds the safe operating limits set by the manufacturer, the valve opens to release some of the pressure and protect the system from over-pressure conditions that could lead to damage or failure.

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