ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 200-001   Flow Diagram, Fuel System

General Information

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CAPS Fuel System

1. Fuel from supply tank
2. Electronic lift pump
3. Fuel filter and water separator
4. Fuel drain line
5. CAPS injection pump
6. Distributor outlet fitting
7. High-pressure supply lines
8. Fuel connector
9. Injectors
10. Fuel return to supply tank

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QSL9 Marine Applications, Cummins® Common Rail Fuel System

1. Fuel from supply tank
2. Fuel filter and water separator
3. Fuel supply to ECM mounted fuel lift pump
4. ECM cooling plate
5. ECM mounted fuel lift pump
6. Fuel outlet from ECM mounted fuel lift pump
7. Fuel gear pump
8. Fuel from gear pump to fuel filter
9. Primary fuel filter
10. Fuel inlet to fuel pump actuator
11. High-pressure fuel pump
12. Fuel outlet from high-pressure pump
13. High-pressure pump drain flow connection
14. Fuel rail
15. High-pressure injector supply lines
16. High-pressure fuel connector
17. Fuel injector
18. Fuel pressure relief valve
19. Fuel injector drain flow line
20. Fuel return to fuel cooler on sea water cooled engines only; fuel return to tank on keel cooled engines
21. Fuel cooler (sea water cooled engines only)
22. Fuel return to fuel tank (sea water cooled engines only).

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QSC8.3 Marine Applications (Sea Water Cooled), Cummins® Common Rail Fuel System With ECM Fuel Cooling

1. Fuel from supply tank
2. Fuel filter and water separator
3. Fuel supply to ECM mounted fuel lift pump
4. ECM cooling plate
5. ECM mounted fuel lift pump
6. Fuel outlet from ECM mounted fuel lift pump
7. Fuel gear pump
8. Fuel from gear pump to fuel filter
9. Primary fuel filter
10. Fuel inlet to fuel pump actuator
11. High-pressure fuel pump
12. Fuel outlet from high-pressure pump
13. High-pressure pump drain flow connection
14. Fuel rail
15. High-pressure injector supply lines
16. High-pressure fuel connector
17. Fuel injector
18. Fuel pressure relief valve
19. Fuel injector drain flow line
20. Fuel return to fuel cooler
21. Fuel cooler
22. Fuel return to fuel tank.

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QSC8.3 Marine Applications (Sea Water Cooled), Cummins® Common Rail Fuel System Without ECM Fuel Cooling

1. Fuel from supply tank
2. Fuel filter and water separator
3. Fuel supply to ECM mounted fuel lift pump
4. ECM plate
5. ECM mounted fuel lift pump
6. Fuel outlet from ECM mounted fuel lift pump
7. Fuel gear pump
8. Fuel from gear pump to fuel filter
9. Primary fuel filter
10. Fuel inlet to fuel pump actuator
11. High-pressure fuel pump
12. Fuel outlet from high-pressure pump
13. High-pressure pump drain flow connection
14. Fuel rail
15. High-pressure injector supply lines
16. High-pressure fuel connector
17. Fuel injector
18. Fuel pressure relief valve
19. Fuel injector drain flow line
20. Fuel return to fuel cooler
21. Fuel cooler
22. Fuel return to fuel tank.