How a Fuel Pressure Regulator Works How a Fuel Pressure Regulator Works

A fuel pressure regulator is a device fitted in every car to help maintain constant fuel pressure for appropriate fuel atomization. This fuel pressure regulator is included in every fuel-injected vehicle. Fuel injectors are fixed in the vehicle and need an exact amount of pressure at the nozzle, during operation. Fuel pressure regulators help in maintaining set pressure for smooth running of the vehicle. The increase and decrease in the fuel flow is controlled by fuel injectors. Moreover, the appropriate amount of fuel flow is also regulated by these injectors.

What does the Fuel Pressure do?

Fuel pressure regulator maintains proper pressure of fuel inside the vehicle. The pressure of this spring is pre set for the required amount of pressure. This pressure helps the pump to pump up required amount of fuel needed for the operation. The exact pressure of the spring is maintained when the fuel is pumped. Extra fuel extracted from the tank is again sent to the fuel tank by the fuel return line. The vacuum hose attached to the fuel pressure regulator decreases the pressure level and a negligible amount of fuel is sucked inside the regulator, when the vehicle is left idle. When the engine is accelerated, vacuum falls down and immediately recovers within a few seconds.

Various Things to Consider

Fuel pressure is affected by this sudden fall of vacuum. This happens because the fuel injectors open wide quite suddenly. A few moments are needed by the fuel injector to catch the pressure created. During these moments, the fuel regulator temporarily shuts the fuel return line. This helps in boosting up the fuel pressure for a few moments. Sensors are used by computer so as to determine air temperature, air density, engine load, throttle position, engine temperature and many more. Using this information, a computer decides the strategy that will result in best performance of the engine taking into consideration emission, fuel economy and power.

Differences in Location of Fuel Pressure Regulators

All vehicles are fixed with fuel pressure regulators. These fuel pressures and fuel pressures regulators differ for each vehicle. The location of the regulators depends upon the vehicle. The place where the fuel pressure regulator is located is not the same for every vehicle either. There is different place prescribed for the fuel pressure regulator on every vehicle.  No matter where the fuel pressure regulator is located, the work done is same in all types of vehicles. 

Importance of Maintaining the Appropriate Fuel Pressure

When a fuel pressure regulator is malfunctioning and fails to maintain the ‘set up pressure’, it may result in leakage, leading to malfunctioning of the engine. When a fuel pressure regulator is not working properly, certain signs are immediately seen. Black smoke is seen along with the oil which exits in the engine, when the vehicle starts. Other signs include rough running of engine that stammers and stumbles. Fouled spark plug is another sign of bad fuel pressure regulator. It is necessary to maintain fuel pressure regulator properly so as to increase the durability of the vehicle.  

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