When does the boost pump deactivate if fuel pressure exceeds 10 PSI?

The boost pump is designed to maintain proper fuel pressure within the fuel system. In this context, the fuel pressure reference point is 10 PSI. When the fuel pressure exceeds this threshold, there is typically no need for the boost pump to continue operation, as the fuel system can maintain adequate pressure on its own.

When determining the specific deactivation point of the boost pump, it generally correlates with the fuel flow requirements and the operational parameters of the engine or system. In many operational contexts, the boost pump is often programmed to deactivate when the fuel pressure reaches around 50% of the maximum rated pressure, which in this case aligns with the option chosen. This ensures that the fuel system can operate efficiently without unnecessary power draw from the boost pump once the needed pressure level is established.

In this scenario, the fuel pressure exceeding 10 PSI indicates that the fuel system is performing adequately, leading to the boost pump being deactivated at this 50% threshold. This approach reflects a balance between adequate fuel delivery and efficient fuel system operation.