What is the appropriate fuel pressure?

[DelJocelyn]

Automobile fuel pressure normally ranges between 300kpa to 350kpa. Below is relevant information about the fuel pressure regulator: 1. Definition: The fuel pressure regulator is essentially an overflow-type relief valve controlled by a diaphragm. The diaphragm divides the regulator into an upper spring chamber and a lower fuel chamber. The diaphragm controls the opening of the relief valve to maintain pressure balance between the upper and lower chambers. 2. Working principle: When the fuel chamber pressure exceeds the combined force of spring pressure and vacuum pressure, the diaphragm arches upward, opening the regulator valve. Some fuel flows back to the fuel tank through the return port via the ball valve, reducing the fuel pressure. When the pressure drops to the regulator's set control pressure, the ball valve closes to maintain a certain pressure in the fuel line from the pump check valve to the pressure regulator.