Kubota D1803-CR-E4 Workshop Manual page 116

4. ENGINE
Fuel flow
(1) Fuel tank
(2) Water separator
(3) Electromagnetic fuel feed
pump
(4) Check valve
1. Fuel from the fuel tank is passed through a water separator and fuel filter by an electromagnetic fuel feed pump
and is supplied to the supply pump.
2. Fuel is pressurized by the supply pump and fed to the rail and injectors.
3. The injectors inject fuel based on instructions from the engine ECU.
4. After injection, surplus fuel passes through overflow pipe and fuel cooler and is returned to the fuel tank.
4-16
(5) Fuel filter
(6) Fuel pump
(7) Supply pump
(8) Rail
(9) Injector
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
(10) Check valve
(11) Overflow pipe
(12) Engine ECU
(13) Fuel cooler
(14) Check valve
MECHANISM
3. Fuel system
(15) Fuel injection
(a) High pressure fuel flow
(b) Low pressure fuel flow
KiSC issued 12, 2018 A