What is the fuel injector pressure?

[ORicardo]

For gasoline engines, the fuel injection pressure is: normally aspirated engines generally have 2.5-3.5 bar, while direct injection fuel rail pressure is typically 120-200 bar. Definition of fuel injector: The fuel injector itself is a normally closed valve (a normally closed valve means that when there is no input control signal, the valve remains closed; whereas a normally open valve remains open when there is no input control signal), controlled by the up and down movement of a valve needle to open or close the valve. Reasons for low pressure: Dirty diesel fuel, impurities in the high-pressure fuel line causing the needle valve pair to not close tightly, high-pressure gas in the combustion chamber backflowing, burning out the needle valve pair, etc.