Technician A says a pressure relief valve closes if the fuel supply line is restricted and pump pressure becomes very high. Technician B says the check valve in the pump prevents fuel from draining out of the fuel system and back into the fuel tank. This helps holds residual pressure in the fuel lines after the pump is turned off. Who is correct?

Question

Quizplus · Accepted Answer

Technician B is correct. The check valve prevents fuel from draining back into the tank, maintaining pressure in the lines. A pressure relief valve opens, not closes, when pressure is too high.

Technician a Says a Pressure Relief Valve Closes If the Fuel