There is a sensor on the fuel rail that monitors fuel pressure and determines if the vehicle needs more or less fuel. This means the fuel pump can vary its speed to deliver fuel as needed, rather than running constantly at a steady speed. Some vehicles are equipped with a returnless fuel supply. Here’s another example of a problem that can trigger the light… Trouble Code: P0087 Fuel Rail/System Pressure – Too Low The light is part of your vehicle’s on-board diagnostics (OBD) system and can indicate anything from a loose gas cap to a major repair like a catalytic converter. Your car’s “Check Engine” or “Service Engine Soon” light can flash on for more than 1,400 different reasons.
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