Fuel System - wsm L503 Workshop Manual

L3130 · L3430 · L3830 · L4630 · L5030, WSM

2. FUEL SYSTEM

(1) Fuel Overflow Pipe
(2) Injection Nozzle
(3) Injection Pipe
The fuel system of this tractor is shown in the diagram above.
Fuel from the tank flows in the passage as shown by the arrows, and is injected from the nozzle via the fuel injection
pump. Overflow fuel returns to the tank.
The system includes filters and other concerns to protect it from entrance of air, water and dust.
While the engine is running, fuel is fed into the injection pump (6) by the fuel feed pump (8) after passing through
the fuel filter (7). The fuel camshaft actuates the injection pump and force-feeds fuel to the injection nozzle (2) through
the injection pipe (3). Fuel is then sprayed through the nozzle into the combustion chamber. The fuel discharged after
lubricating and cooling the injection nozzle is returned to the fuel tank (4) automatically through the overflow pipe (1).
(4) Fuel Tank
(5) Injection Pump Air Vent Pipe
(6) Injection Pump
(7) Fuel Filter
(8) Fuel Feed Pump
(9) Fuel Filter Air Vent Pipe
1-M2
ENGINE
a : Injected Fuel Flow
b : Returned Fuel Flow
KiSC issued 02, 2007 A