Performance failure of Land Rover fuel pressure regulator (Land Rover found Shen Xing solenoid valve failure).

Clean the fuel injector, throttle body and idle motor. If the fuel pressure regulator fails, check whether the fuel injector, throttle body and idle motor are dirty in time, and then check and clean them.

Fuel pressure regulator, a special term for automobile industry. It is one of the common components of EFI automobile fuel injection system. Function: components to ensure normal fuel pressure in automobile oil circuit.

Working principle: the oil pressure is coordinated by the spring and the vacuum degree of the air chamber. When the oil pressure is higher than the standard value, the high-pressure fuel pushes the diaphragm upward, the ball valve opens, and the excess fuel flows back to the oil tank through the oil return pipe; When the pressure is lower than the standard value, the spring will compress the diaphragm, close the ball valve and stop oil return. The function of the pressure regulator is to keep the pressure in the oil circuit constant. If the oil pressure is too low, the injector will inject too little or no oil. If the oil pressure is too high, it will damage the oil circuit or injector.

There is a diaphragm inside the pressure regulator to control the opening and closing of the pressure valve. When the oil pressure is lower than a certain value, the pressure valve is closed and the pressure in the oil circuit is increased by the oil pump. When the pressure is higher than the specified pressure, the diaphragm opens, and the overpressure fuel flows back to the fuel tank through the oil return pipe, which plays a role in reducing pressure.