RV125K7 (’07-MODEL) 25
FUEL INJECTOR
The system employs fuel injector (Discharge pump; DCP) that causes injection fuel to be pressurized within
the pump.
The fuel injector pressurizes gravity fed fuel with its plunger and injects the pressurized fuel into the intake
pipe. With the pressure plunger controlled by ECM, necessary volume of fuel is injected at the best timing
for the engine operating condition.
Operation
• When the plunger returns, fuel in the pump chamber enters through IN check valve.
• By the ECM signal, the coil is energized causing the plunger to pressurize fuel. This pressurization occurs
after vapor inside the pump chamber has been bled through the pressure valve.
• When the pressurization begins, OUT check valve opens and the fuel pressure rises until the injection
nozzle opens.
• The volume of fuel injection is controlled by the length of time in which the plunger compresses fuel.
• When the ignition switch is turned ON, the discharge pump starts to operate for 2 seconds for purging (ini-
tial operation).
Vapor
Coil
Pressure valve
IN check valve
OUT check valve
Fuel
Filter
Orifice
Injection
Plunger
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