SHROUD AS 4568682 - Caterpillar

Probable Causes
Cold Mode
Engine in cold mode (if applicable)Fuel Supply
Fuel supply valve (if applicable)
Improperly operating fuel pressure regulator
Fuel level
Blockage of the vent port on the fuel cap
Proper operation of the electric fuel priming pump
Diagnostic codes for the fuel pump relayInjection Actuation Pressure
Engine oil level
Proper operation of the injection actuation pressure control valveThrottle Signal
Intermittent throttle signalInjectors
Injector misfiringAir Inlet and Exhaust System
Restriction in the air inlet and exhaust systemRecommended Actions
Note: If the problem only occurs under certain conditions, test the engine under those conditions. Examples of certain conditions are high engine speed, full load and engine operating temperature. Troubleshooting the symptoms under other conditions can give misleading results.Engine in Cold Mode (if applicable)
Use Caterpillar Electronic Technician (ET) to verify that the engine has exited cold mode. Cold mode operation may cause the engine to run rough and engine power may be limited.Fuel Supply Valve (if applicable)
Ensure that the fuel supply valve (if equipped) is in the full OPEN position.Improperly Operating Fuel Pressure Regulator
An improperly operating fuel pressure regulating valve may cause low fuel pressure. If a problem is suspected, inspect the return fuel pressure regulating valve. Clean any contamination or debris that may keep the regulating valve from operating properly. If debris is present, find the source of the contamination. Replace the return fuel pressure regulating valve if the valve is worn or damaged.Fuel Level
Visually inspect the fuel level in the fuel tank. Ensure that the fuel tank contains enough fuel in order to operate the engine.Blockage of the Vent Port on the Fuel Cap
Remove the fuel tank cap from the fuel tank. Check the vent port that is in the cap for debris. Clear any restrictions with compressed air.Note: Do not allow debris to enter the fuel tank while you clean the cap. Damage to the fuel system will occur.Proper Operation of the Electric Fuel Priming Pump
The electric fuel priming pump provides the fuel to the low pressure fuel system. When the keyswitch is turned to the ON position, the electric fuel priming pump runs for two minutes. This should prime the fuel system. If the fuel system is not fully primed, turn the keyswitch to the OFF position and repeat the sequence.When the engine is cranking or running the electric fuel priming pump will run continuously. There is no fuel transfer pump in the unit injector hydraulic pump.Prime the fuel system if any of the following procedures have been performed:
Replacement of the fuel filters
Service on the low pressure fuel supply circuit
Replacement of unit injectorsStart the engine. Run the engine at low idle. Use Cat ET to monitor the fuel pressure for the engine.Check the value of the fuel pressure while the engine is at low idle. Ensure that the value of the fuel pressure is reasonable. If the value of the fuel pressure fluctuates, there may be blockage to the intake side of the electric fuel priming pump.Inspect the lines to the electric fuel priming pump. Check the fuel lines for the following: kinked fuel suction line, collapsed lines