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Fuel from feed pump flows into the outer side of the filter housing and filtered by the element and supplied
to the fuel injection pump. The above diagram shows the flow path of fuel in fuel filter.
FUEL INJECTION PUMP:
The Bosch in line type fuel injection pump is used. The injection
pump, that forces fuel into the injection nozzle under pressure is
provided with a mechanism to increase or decrease the amount of
fuel. It has one plunger and delivery valve for each cylinder.
The plunger pushed up by the camshaft and pushed back by the
plunger spring, moves up and down in the plunger barrel on a
predetermined stroke to feed fuel under pressure. In doing so it
opens and closes the suction and discharge ports to adjust the fuel
injection rate.
The Constant speed governor of the fuel injection pump is capable of holding rated speed steadily
irrespective of variation in loads.
INJECTION NOZZLE:
The injection nozzles are of the hole type. The fuel delivered from
the injection pump enters the nozzle holder. When it reaches the
specified pressure value, the fuel overcomes the spring force to push
up the needle valve of the nozzle tip, spraying from the injection
orifice at the end of nozzle into the cylinder.
The injection pressure can be adjusted by increasing or
decreasing the number of washers in the spring.
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