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8
9
./
-
6
.------
Fig. 1·8 Feed Pump
1---- Hand pump;
2 - -
Check valve; 3 -
Pump
housing; 4 - - Inlet banjo connec-
tion bolt; 5-Push rod; 6-Piston; 7-.Piston spring; 8-0utlet banjo connection
bolt; 9-Check valve.
. The maill function of the feed pump is to keep the low pres-
sure fuel passage
full
of fuel with certain pressure.
The feed pump is of automatic' pressure regulated ty'pe to en-
sure the fuel pressure stead}Y, When the fuelpressu!ewithin the
low pressure fuel passage exceeds 49KPa, the fuel pressure will
compress the resilieIlt ,spring through the piston to make the pis-
ton apart from the push rod gradually and as a result, the fuel de-
livery will be reduced or stopped.
The hand pump is used to make the fuel delivery system ex-
pelling the trapped air out and being full of fuel before the engine
starting. When it isn't in use,
~he
hand' pump piston should be de-
pressed down and the knob should be tightened ,so that the oil pas-
44
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