What are the reasons for low fuel rail pressure?

[WestonLynn]

The reasons for low fuel rail pressure include: 1. Fuel line blockage or excessive water content in the fuel causing low fuel rail pressure; 2. All cylinder injectors are connected to a common fuel pipe (referred to as the fuel rail), which maintains constant pressure. If damaged, it can lead to low fuel rail pressure; 3. If the fuel injectors are clogged or damaged, it can also cause low fuel rail pressure. Relevant information about the fuel pressure regulator is as follows: 1. Introduction: The fuel pressure regulator is a device that adjusts the fuel pressure entering the injectors based on changes in intake manifold vacuum, keeping the difference between fuel pressure and intake manifold pressure constant, thereby maintaining a consistent injection pressure under different throttle openings. 2. Function: The fuel pressure regulator is installed at one end of the fuel distribution pipe and serves two purposes: first, to regulate the fuel pressure in the supply system, maintaining a constant difference between system pressure and intake manifold pressure (the set value is generally 300 kPa); second, to dampen pressure pulsations generated by the fuel pump during fuel supply and pressure fluctuations caused by intermittent fuel injection.