The PCM
In an electronic returnless fuel system, the PCM -- as the vehicle's onboard computer that regulates engine functions -- takes the pressure information delivered to it by the fuel pressure sensor and relays the engine's fuel needs to the fuel pump, which supplies the engine with fuel.Function
The fuel pressure sensor senses the dimensions of fuel in the fuel inveigh by reading the internal compel of the castigate. It can then mail an electronic message to the PCM telling it precisely how much fuel needs to be released into the engine.
In cars with an electronic returnless fuel method, a fuel pressure sensor -- a inconsequential electronic Slogan located along a vehicle's fuel inveigh -- feeds fuel pressure info to the endowment train government module, or PCM.
The Facts
Electronic returnless fuel systems shorten evaporative emissions from automobiles by feeding the engine single the precise extent of fuel it needs to flight. This course of action, the engine avoids leaving excess fuel to evaporate in the fuel borderline.
