What happened to Toyota LC80FUELTANK?

It's the tank pressure sensor fault. Troubleshooting methods of fuel sensor Clean the fuel injector, throttle body and idle motor, check whether the vacuum diaphragm is broken, discharge mixed gas, check the tightness of the regulator and check the ignition system failure. We must use the ignition system when starting. If there is a problem with the ignition system, the fuel pressure regulator will not start, which will lead to a failure and affect our normal driving.

Function of fuel tank pressure sensor

The fuel pressure sensor, also known as the fuel pressure regulator, is used to control the fuel pressure in the oil circuit, so as to maintain the constant fuel supply pressure of the injector and send the excess fuel back to the fuel tank. There is a pressure chamber in the fuel pressure regulator, a vacuum chamber in the diaphragm with an overflow valve, and a spring in the chamber. The pressure of fuel system acts on the diaphragm together with the vacuum degree of intake pipe and the pressure difference caused by spring force.

When the pressure difference between the fuel system pressure and the vacuum degree of the intake pipe is lower than the spring force, the overflow valve is closed; When the pressure difference between the pressure of the fuel system and the vacuum degree of the intake pipe is greater than the elastic force of the spring, the overflow valve opens, and the excess fuel flows back to the fuel tank through the oil return pipe, so that the pressure of the fuel system can be adjusted and the fuel supply pressure of the injector can be kept constant.