FUEL PRESSURE – AND WHY IT’S IMPORTANT
Most Common Fuel Pressure Fault Codes
EID 396 – High Fuel Rail Pressure
The fuel rail pressure is above an acceptable level. The code is logged. Engine power is derated. The engine may stop.
Possible causes for high fuel pressure include:
Fuel pressure regulator
Obstructed return lines
Fuel rail pressure sensor
Fuel Rail Relief Valve (PRV)
High-pressure fuel pump
EID 398 – Low Fuel Rail Pressure
The fuel rail pressure is below an acceptable level. The code is logged. Engine power is derated. The engine may stop.
Possible causes for a low fuel pressure include:
Fuel system leaks
Low/Cold temperatures may cause fuel to gel
Restricted/Obstructed fuel lines
Obstructed fuel filters
High water content in the fuel or the water separator requires draining
Air in the fuel system or fuel system requires priming
Electric fuel lift pump
Fuel rail pressure sensor
Caterpillar diesel engine fuel systems are composed of a specialized set of components that must deliver the correct amount of fuel to the cylinder – at the precise moment, it is needed.
A well-designed fuel system enables the engine to produce maximum power at maximum efficiency, with a minimum of exhaust emissions.
Components of a Basic Fuel System
The basic fuel system consists of a fuel transfer pump, fuel filters, fuel injectors, and a fuel pressure regulator. Fuel pressure is controlled by the pressure regulating valve, and it must be able to provide the correct fuel pressure to the injectors at all times.
Today’s diesel injectors must develop very high injection pressures to function with modern high-compression ratio engine designs. The fuel system is responsible for providing an adequate supply of clean and stable fuel for proper operation.
Results of Incorrect Fuel Pressure
Incorrect fuel pressure may result in conditions such as:
Poor throttle response
No start events
Inhibited Aftertreatment system operation
A variety of other performance concerns.
If you are experiencing performance concerns or have any questions about your equipment – Reach out to your service representative or your local H.O. Penn branch immediately.
Be sure to inspect and service your fuel system regularly. A healthy fuel system can increase the life span of your equipment and will ensure you always PRODUCE MAXIMUM POWER AT MAXIMUM EFFICIENCY.
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