How does the pressure in the fuel rail work?
Pressure transfers fuel out of the storage tank, through the fuel rail, and to the engine. Depending on the fuel system’s design, the powertrain computer module (PCM) manages the pressure levels by adjusting either the fuel pump or the fuel volume regulator.
Where is the fuel rail on a car?
The fuel rail is the long, round metal bar that runs along the top of the injectors and is held onto the manifold with a few bolts. It supplies fuel to the fuel injectors mounted directly on the fuel rail.
What is the code for the fuel rail?
Note: Code P0087 is a generic code specified by the Society of Automotive Engineers (SAE). Depending on the car manufacturer, the code’s definition may change. The PCM keeps track of the pressure levels within the fuel rail.
Why does fuel line pressure cause engine to stall?
Fuel pumps are designed to pump liquid, not air, and the increased pressure inside the fuel lines keeps the fuel pump from being able to keep the fuel moving. The result is fuel starvation causing the engine to run rough or completely stall.
Why is there no pressure on the fuel rail?
If the pressure at the exit side of the fuel filter is normal and yet the pressure on the fuel rail is essentially zero, it’s possible the fuel pressure regulator has failed wide open, essentially preventing sufficient pressure from building.
What are the functions of the fuel rail?
The fuel system is one of the most important parts of fuel engines and low-emission diesel engines. The rail pressure comprises feedforward control and derivative feedback control. A fuel rail is one of the components of the fuel injection, it is responsible for a stable supply of fuel to the injector.
How does a fuel rail pressure sensor work?
The fuel rail pressure sensor performs the task of letting the vehicle sense the fuel pressure at all times. The high-pressure pump applies system pressure to the fuel, which the fuel rail then delivers to the injectors. A high-pressure pump adjusts the pressure in the fuel rail whenever necessary.
What to look for in a common rail diesel engine?
First, allow the fuel to rest and reach room temperature; if water is present, it will begin to separate from the fuel. Also, look for items floating and/or suspended in the fuel. Metal debris may be difficult to see in a fuel sample test tube.