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The fuel pressure regulator works with the rest of the fuel system to improve the performance of the engine, enabling it to work as efficiently as possible while increasing the life of the engine.
The fuel pressure regulator is usually part of the fuel injector rail. The fuel injector rail is attached to the fuel tank, having an inlet for each injector and an inlet to the fuel supply.
Fuel systems in modern vehicles deliver adjustable fuel pressure, adapting the pressure to meet the demands of the power output of the engine. Fuel pressure and the timing of fuel injection are crucial to determining the amount of fuel entering the cylinders. The fuel injection system generally primarily consists of an electronic fuel pump, fuel metering valves, a fuel injector rail with a fuel pressure regulator/sensor, and fuel injectors, which work together to ensure the correct fuel pressure is achieved and the exact amount of fuel injected into the cylinders at precisely the right time. The fuel is sprayed into the chambers of the engine, controlled by the computerised control unit, which manages the timing of this process. The fuel injectors are fitted close to the inlet manifold, one for each cylinder, and are all calibrated (adjusted) to equally spray a mist of fuel into the intake of each cylinder in a sequence controlled electronically, for the sequential firing of the engine. The overall result of this ensures the engine is working to its optimum, providing more power and fuel efficiency. The fuel pressure regulator measures the pressure of the fuel in the fuel rail. This information is sent to the car's ECU (Engine Control Unit) which makes adjustments based on this and various other data from other engine sensors to ensure the conditions are perfect for optimum combustion.
An engine that won't start; a misfiring engine; an engine that struggles and stutters at high speeds; loss of power while accelerating; loss of power when driving uphill; and the vehicle surging or jumping forward when in motion could all be signs of a fuel pressure regulator. There are many things that can go wrong in the engine and with the fuel system, so it is a good idea to consult with your mechanic to establish the exact cause of the fault before buying replacement parts. Specifically designed for the make and model of your vehicle, the fuel pressure regulator is the ideal choice when replacing this part.