CAC Gasoline Engine Maintenance And Servicing Manual
82
The following accessories and engine air filter are installed on the upper body of throttle valve.
·fuel system pipe and fuel return pipe
·fuel pressure regulator
·bottom-supplying fuel injector IWM
·intake air temperature sensor.
——Fuel pressure regulator
As engine is running, fuel pump supplies fuel (fuel supply volume of pump is about 80L/h) through
filter and pipe to fuel pressure regulator(chart 137). The regulator is designed to keep the specified fuel
pressure at 1bar(0.9-1bar), and redundant fuel will recirculate flowing into fuel tank. Fuel will clean and cool
injector during recirculation.
——working procedure of Fuel pressure regulator .
Spring (2) applies pressure on the diaphragm(7) connected
to sealing valve(6) keeping cavum closed between fuel
delivery pipe and fuel return pipe(4).
whe fuel pressure in pipe(3) exceeds 1 bar , pressure on
diaphragm(7) will overcome spring(2) resistance, then
diaphragm goes up raising sealing valve up to allow redundant
fuel to flow back and returns to proper work pressure.
during producing, fuel pressure regulator pressure is
calibrated by socket head bolt and will never changed under
any circumstance.
——Fuel
injector
1. socket head regulator screw
2. spring
3. fuel output pipe
4. fuel return pipe
5. spring
6. sealing valve
7. diaphragm
Fig.137 fuel pressure regulator
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