In a fuel system the main pumps are engine driven, and have what to prevent high pressures?

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Multiple Choice

In a fuel system the main pumps are engine driven, and have what to prevent high pressures?

Explanation:
Engine-driven main fuel pumps can push fuel at higher pressures when the downstream path is restricted or during rapid changes in demand. A pressure relief valve is built into the pump assembly and is set to open at a predetermined pressure. When the discharge pressure reaches that limit, the valve opens and fuel is diverted back to the pump inlet or to the tank, preventing over-pressurization of the system. This protects fuel lines, filters, and the engine fuel control from damage and helps maintain stable operation during start and throttle changes. While a regulator controls normal operating pressure, the relief valve provides a safety limit to prevent excessive pressures.

Engine-driven main fuel pumps can push fuel at higher pressures when the downstream path is restricted or during rapid changes in demand. A pressure relief valve is built into the pump assembly and is set to open at a predetermined pressure. When the discharge pressure reaches that limit, the valve opens and fuel is diverted back to the pump inlet or to the tank, preventing over-pressurization of the system. This protects fuel lines, filters, and the engine fuel control from damage and helps maintain stable operation during start and throttle changes. While a regulator controls normal operating pressure, the relief valve provides a safety limit to prevent excessive pressures.

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