Kubota D1703-B User Manual

M.5 FUELSYSTEM
92.4mm STROKE SERIES WSM, 01092
[5] FUEL LIFT PUMP
A
A109F028
Filtered fuel is fed to the injection pump by the
fuel lift pump. The fuel
lift pump operates as shown
in the figure. Power is applied to the tappet by an
eccentric movement on the fuel camshaft. As the
fuel camshaft rotates, the eccentric movement causes
the tappet
to move up and down. The tappet is
linked to a flexible diaphragm (4) via the pull rod.
When
the diaphragm is pulled down, a low
vacuum or low pressure area
is created above the
diaphragm.
This causes atmospheric pressure in the
fuel tank to force fuel into the fuel
lift pump. The
inlet valve (1) opens to admit fuel into the chamber
(3).
When the diaphragm is pushed up, pressure is
created in the area above the diaphragm. This
pressure closes the inlet valve and opens the outlet
valve
(2), forcing fuel from the pump through the
fuel pipe to the injection pump.
[A] Inlet Stroke
[E] Discharge Stroke
(a) From Fuel Filter
(b) To lnjection Pump
(1) Inlet Valve
(2) Outlet Valve
(3) Chamber
(4) Diaphragm
M-29

Kubota D1703-B Specifications

General

Brand	Kubota
Model	D1703-B
Category	Engine
Language	English