ISBe/ISB Series Engines – 200-001   Flow Diagram, Fuel System

General Information

SMALL | MEDIUM | LARGE

Without Electric Lift Pump

1. From fuel supply tank
2. Water/fuel separator (not mounted on engine)
3. ECM cooling plate*
4. To fuel gear pump
5. To fuel filter
6. Fuel filter head
7. Fuel filter
8. To high-pressure pump
9. High-pressure pump
10. To fuel rail
11. Fuel rail
12. To injectors
13. High-pressure connector
14. Injector
15. Fuel return from injectors and fuel rail to fuel filter head
16. Fuel return from high-pressure pump to fuel filter head
17. Fuel return manifold
18. To fuel supply tank.

NOTE: * Engines are either equipped with an air cooled or fuel cooled ECM. If an air cooled ECM is used, the fuel enters the engine from the OEM connection at the gear pump inlet.

SMALL | MEDIUM | LARGE

With Electric Lift Pump

1. Fuel inlet – ECM cooling plate
2. ECM cooling plate
3. Lift pump
4. Fuel line (from lift pump to fuel filter)
5. Fuel filter
6. Fuel pump inlet to gear pump
7. EFC actuator
8. Fuel pump
9. High-pressure fuel line (fuel pump to rail)
10. Fuel rail
11. Fuel rail pressure sensor
12. Fuel pressure relief valve
13. High-pressure fuel line (fuel rail to fuel injector)
14. High-pressure connector to fuel injector
15. Fuel injector
16. Injector return line
17. Pressure relief return line
18. Fuel pump return line
19. Fuel return manifold.