Fuel Feed Pump; Outline Of Fuel Feed Pump; Structure Of Fuel Feed Pump; Function Of Fuel Feed Pump - Kubota D1803-CR-E4 Workshop Manual

MECHANISM
3. Fuel system

3.8 Fuel feed pump

3.8.1 Outline of fuel feed pump

The fuel feed pump supplies fuel to supply pump by
mechanical.

3.8.2 Structure of fuel feed pump

The fuel feed pump is made up of fuel feed pump body,
priming pump and the like.
(1) Fuel feed pump body
(2) Priming pump

3.8.3 Function of fuel feed pump

The fuel feed pump supplies fuel to supply pump by
mechanical.
The fuel feed pump is provided with a priming pump.
This is for air removal through manual operation of the
priming pump.
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
(A) Fuel inlet
(B) Fuel outlet
(1) Check valve (suction side)
(2) Piston spring
(3) Piston
(4) Check valve (suction side)
(5) Tappet
(6) Fuel cam
(7) Inner chamber
(8) Check valve (discharge side)
During the up stroke, the piston (3) is pushed up by the
fuel cam (6) via the tappet (5) and push rod (11).
As a result, the pressure in the inner chamber (7) rises,
the check valve (suction side) (1) closes and the check
valve (discharge side) (8) opens.
On the other hand, the pressure in the outer chamber
(10) is lowered so the check valve (suction side) (4)
opens and check valve (discharge side) (9) closes.
During the down stroke the piston is lowered by a
piston spring (2) and the pressure in the inner chamber
is lowered so the suction side check valve opens and
discharge side check valve closes.
On the other hand, the pressure in the outer chamber
rises so the suction side check valve closes and
discharge side check valve opens.

3.8.4 Specification of fuel feed pump

Maximum discharge pressure
(Cutoff pressure)
4. ENGINE
(9) Check valve (discharge side)
(10) Outer chamber
(11) Push rod
(A) Suction side
(B) Discharge side
[A] Up (suction) stroke
[B] Down (discharge) stroke
500 kPa
2
5.10 kgf/cm
72.5 psi
4-19
KiSC issued 12, 2018 A