How do you release pressure on common rail?
You don’t need to disconnect the fuel rail to pull the motor, just unbolt it from the manifold and set it to the side. You can bleed it by slowly releasing pressure via the Schrader valve under the green cap on the fuel line. Wrap a rag around it as you will get fuel spray until the pressure is released.
What maintains fuel rail pressure on a current high pressure common rail system?
The pump maintains the rail pressure by continuously delivering fuel to the common rail. One way is to supply more fuel than is needed to the common rail and use a high pressure regulator—commonly referred to as a pressure control valve—in the high-pressure circuit to spill the excess fuel back to the fuel tank.
What is a high pressure fuel rail?
The high-pressure rail gives its name to the common-rail system and binds the pump and injectors together as the central hydraulic component. It stores the compressed fuel and supplies this to the injectors.
Where is the common rail high pressure relief valve?
Common Rail High Pressure Relief Valve This is the pressure relief valve located in the driver’s side fuel rail on the 2004.5 – 2007 Duramax LLY & LBZ engines. These valves are known to go bad and open prematurely causing a “fuel rail PSI low” problem. Once a valve is weakened it tends to get worse.
Where is the fuel pressure relief valve on a Cummins 15?
Cummins ISX Fuel Pressure Relief Valve Location On the ISX 15, the fuel pressure relief valve is on the end of the fuel rail toward the front of the engine. It is screwed directly into the fuel rail on one end and has a banjo type fuel line fitting on the other which is sealed by 2 sealing washers.
Can a fuel rail high pressure relief valve go bad?
These valves are known to go bad and open prematurely causing a “fuel rail PSI low” problem. Once a valve is weakened it tends to get worse. Replacing the valve with a new one is much safer than shimming it and taking your chances with the high (22,000+ PSI) pressures that this valve was designed to protect from.
Where is the high pressure fuel pump located?
Fuel pump actuator 14. High-pressure fuel pump outlet 15. High-pressure fuel rail supply 16. Fuel rail 17. Fuel pressure sensor location 18. High-pressure relief valve and drain 19. High-pressure injector supply lines 20. High-pressure fuel connector