Function Of Injection Pipe; Rail Assembly; Outline Of Rail Assembly; Structure Of Rail Assembly - Kubota D1803-CR-E4 Workshop Manual

4. ENGINE

3.11.3 Function of injection pipe

Injection pipes connect the supply pump and rail as
well as the rail and injectors.

3.12 Rail assembly

3.12.1 Outline of rail assembly

The rail stores high pressure fuel and delivers it to each
of the injectors.

3.12.2 Structure of rail assembly

The rail assembly is made up of a rail body, rail
pressure sensor, and pressure limiter.
(1) Rail pressure sensor
(2) Rail body
4-24
(3) Pressure limiter
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
Wiring diagram
(4) Terminal 5V
(5) Terminal signal
(6) Terminal ground
(7) +5 V

3.12.3 Function of rail assembly

The rail assembly stores high pressure fuel fed from
the supply pump and while retaining the pressure,
delivers fuel to the injectors for each cylinder.
The pressure of the fuel in the rail is detected by the rail
pressure sensor, and optimal feedback control is
provided for the engine speed and load.
This greatly improves the ability to raise the pressure at
low speed and enables high-pressure injection from low
speed ranges.
MECHANISM
3. Fuel system
(8) Engine ECU
(a) Rail pressure sensor con-
nector
KiSC issued 12, 2018 A