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> Figure 53. Pressure - Timed Gear Pump.
Figure 52. Pressure - Timed Injection System.
PTD Injectors
Principles of Gasoline And Diesel Fuel Systems
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PRINCIPLES
GASOLINE/DIESEL
FUEL
SYSTEMS
-
OD1620
-
LESSON
2/TASK
2
FIGURE
53.
PRESSURE-TIMED
GEAR
PUMP.
(a) The gear-type
pump
draws fuel from the supply tanks and forces
it through the
pump
filter screen to the governor. It is driven by the
pump
main shaft and picks up and delivers fuel throughout the
fuel system
.
A
pulsation
damper
mounted
to the gear
pump
contains a steel diaphragm that
absorbs pulsations and
smooths
fuel flow through the
fuel system
.
From
the
gear pump, fuel flows through the filter screen to the governor screen. The
PTG
pumps
are equipped with a bleed line that is attached to the engine
injector return line or to the tank.
This prevents excessive fuel
temperature within the fuel
pump
by using the surplus fuel as a coolant.
The bleed line functions primarily
when
the
pump
throttle is set at idle
speed, but gear
pump
output is high due to engine operating speed, as occurs
during downhill operation. A special check valve and/or fitting is used in
the gear
pump
to accomplish the bleed action.
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