Ezgo 1600xd Repair Manual page 62

A. PUMP ELEMENT
2
1
3
(1) Pump element
(2) Cylinder
(3) Plunger
(4) Feed hole
The pump element (1) consists of a plunger (3) and
cylinder (2) which their sliding surfaces are finely
machined to maintain the fuel tightness. The plunger
(3) is installed in the control sleeve (5) and the sleeve is
engaged with the control rack that rotates the plunger in
the cylinder to control the amount of fuel delivered.
3
-24
ENGINE - STRUCTURE AND FUNCTION
4
5
6
7
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(5) Control sleeve
(6) Control groove
(7) Sliding surface
B. OPERATION OF PUMP ELEMENT
3
1 4
5
6
2
(1) Delivery chamber
(2) Plunger
(3) Delivery valve
a. Before delivery
As the plunger (2) lowers, fuel is drawn into the delivery
chamber (1) through the feed hole (4) from the fuel
chamber (5).
b. Beginning of delivery
When the plunger is pushed up by the cam and the head
of the plunger closes the feed hole (4), the pressure in the
delivery chamber (1) rises to push the delivery valve (3)
open.
c. Delivery
While the plunger (2) is rising, delivery of fuel continues.
d. End of delivery
When the plunger rises further and the control groove (6)
on its periphery,meets the feed hole, the injection stops
because the pressure in the delivery chamber (1) is
reduced to the opening pressure.
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(4) Feed hole
(5) Fuel chamber
(6) Control groove
SUUV-W00 Apr. 2011