0303831 EVINRUDE HOUSING, Impeller

Fuel Supply
Fuel supply valve (if applicable)
Improperly operating fuel pressure regulator
Fuel level
Restriction in the vent port on the fuel cap
Proper operation of the electric fuel priming pump
Diagnostic codes for the fuel pump relayFlash File
Incorrect flash fileAir Inlet and Exhaust System
Restriction in the air inlet and exhaust systemInjection Actuation Pressure Control Valve
Engine oil level
Proper operation of the injection actuation pressure control valveInjectors
Injector connectorsCodes
Diagnostic codesRecommended Actions
Note: If the problem only occurs under certain conditions, test the engine under those conditions. Troubleshooting the symptoms under other conditions may give misleading results.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.Restriction in 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 and contamination.Diagnostic Codes for the Fuel Pump Relay
Use Cat ET to check for diagnostic codes for the fuel pump relay. If diagnostic codes for the fuel pump relay are logged or active, refer to Troubleshooting, "Fuel Transfer Pump - Test".Incorrect Flash File
Verify that the latest flash file has been installed into the Electronic Control Module (ECM).Restriction in the Air Inlet and Exhaust System
Ensure that the turbocharger is operating correctly. Periodic inspection and cleaning is recommended for the turbocharger compressor housing (inlet side). Refer to Systems Operation/Testing and Adjusting for the procedure to inspect the turbocharger.Check the air inlet and exhaust systems for restrictions and for leaks. Refer to Systems Operation/Testing and Adjusting for the procedure to inspect the system. Look for an indication of the warning lamp or restriction indicators that are tripped if the filters are equipped with these devices. These indicators are associated with plugged filters. Replace the plugged air filters or clean the plugged air filters per the guidelines of the Operation and Maintenance Manual. Repair any leaks that are found in the system.Engine Oil Level
Check the engine oil level. Engine oil supplies the injection actuation pressure circuit. The engine oil must be kept at the proper level for fuel injection.Proper Operation of the Injection Actuation Pressure Control Valve
Check the operation of the injection actuation pressure control valve. Refer to Troubleshooting, "Injection Actuation Pressure Control Valve - Test".
Check the injection actuation pressure. Refer to Troubleshooting, "Injection Actuation Pressure - Test". Injectors
Disconnect the J1/P1 and J2/P2 ECM connectors. Inspect each connector for moisture and corrosion. Also, inspect the harness and connectors for the injectors from the ECM to the valve cover. Refer to Troubleshooting, "Electrical Connectors - Inspect".Use Caterpillar Electronic Technician (ET) to perform the injector solenoid test in order to determine if all of the injector solenoids are being energized by the ECM. Refer to Troubleshooting, "Injector Solenoid - Test".Diagnostic Codes
Certain diagnostic codes and/or event codes may cause poor performance. Connect Cat ET and check for active codes and/or logged codes. Troubleshoot any codes that are present before continuing with this procedure.Note: Although a sensor's signal may be in the operational range of the sensor, certain failure modes of a sensor may produce an output signal that does not represent an accurate measurement. Use Cat ET to check that the pressures and the temperatures are fluctuating normally. Also check that the values are reasonable for the conditions that are present.