A fuel rail pressure sensor is a component which has the ability to reduce evaporative emissions. Since these emissions tend to come through the vehicle, the fuel rail sensor allows the engine just enough fuel so that it can run in the correct way. This is an automotive component that limits the fuel’s ability to get left inside of the fuel line, which can then evaporate and migrate elsewhere. The fuel rail pressure sensor operates by reading the internal pressure of the rail itself. This is how it is able to sense the precise amount of fuel still present inside of the fuel rail. When the sensor detects fuel in the rail, there is an electrical signal that is actuated by the system. This serves to indicate the precise amount of fuel which is needed to power the engine at any given throttle level.
Common Symptoms of a Bad Fuel Rail Pressure Sensor
- Engine hard / difficult to start
- Engine rough idling and will stall
- Engine hesitate when acceleration
- The DTC or Engine light comes on (typically the DTC code is P0190)
When a fuel rail pressure sensor begins to malfunction, there are some common symptoms that will likely begin to show up which can serve to alert the vehicle owner that there is something wrong. For example, a vehicle experiencing these kinds of problems will typically have a difficult time starting up, and the engine may begin operating in an erratic fashion. There may even be instances where problems with a fuel rail pressure sensor will lead to an engine simply cutting out during normal operation. Additionally, there will probably be a dashboard error message or light that comes on if these kinds of issues arise. Usually, replacing the sensor is not a particularly difficult or costly endeavor, so fixing the issue should not be too complicated.
How fuel rail sensor works?
The fuel rail pressure sensor has a negative pressure supply of fuel which is ready to be used by the injectors in the engine. When a pressure drop takes place in the rail, a sensor will alert the main engine control unit. Once the engine control unit is notified of the pressure drop, there is a resuming of pressure within the pump. This can typically be achieved by utilizing a specific valve for maintaining the fuel pressure. If a fuel rail pressure sensor is showing signs of malfunction, it is critical that a mechanic be enlisted to evaluate the condition of the engine. After all, this is such a crucial component for ensuring the successful operation of an internal combustion engine.
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This is a sensor component that will malfunction over time, but there is good news for anyone who is having issues with this engine component. The good news is that when problems arise with the fuel rail pressure sensor, it is usually only the sensor that is going to require replacing and not the entire part itself. This means that people experiencing issues with their fuel rail sensor can feel relieved because they will likely only have to replace the sensor and not the whole thing. With that being said, there are some tell-tale signs that there may be an issue with a fuel rail pressure sensor. Knowing what to look for can help catch the problem early, and fix it before any complications arise.