Aeon 350cc, Service Manual

Page: 110 / 192

ELECTRONIC FUEL INJECTION
5-110
FUEL INJECTOR REPLACEMENT
1. Be sure the engine has cooled enough to work on.
2. Remove the seat and the storage box.
3. Thoroughly clean the area around the fuel injectors
including the throttle body manifold.
4. Using a 6mm hex wrench, loosen the fuel rail mounting
screw from the cylinder head. Carefully pull the rail away from
the injectors and remove the injector from the cylinder head
along with the harness.
5. Reverse the previous procedures to install the new injector
and reassemble.
6. Lubricate O-rings lightly with oil to aid installation. Torque
the fuel rail mounting screw to specification.
Fuel Rail Mounting Screw
2.5 Nm (22 in. lbs.)
FUEL PUMP OPERATION OVERVIEW
An electric fuel pump is used to transfer fuel to the EFI system
from the fuel tank.
The pump rate had a minimum 14.4 liters per hour at 3.0 bar
(43.5 psi) output.
When the key switch is turned to "ON", the ECU activates the
fuel pump, which pressurizes the system for start-up.
The ECU switches off the pump preventing the continued
delivery of fuel in these instances:
• If the key switch is not promptly turned to the "start"
position.
• If the engine fails to start
• If the engine is stopped with the key switch "on" (as in the
case of an accident).
In these situations, the “check engine” light will go on, but will
turn off after 4 cranking revolutions if system function is OK.
Once the engine is running, the fuel pump remains on.
FUEL PUMP TEST
The fuel pump is non-serviceable. If fault code diagnosis
indicates a problem within this, It may be possible that the fuel
pump must be replaced.
Check the fuel test for any possible fuel seepage
after performing any tests or procedures. Fuel is
extremely flammable and may cause severe burns,
injury, or death.
Do not use any device that produces a flame or
electrical devices that may spark around fuel or fuel
vapors.
1. Remove both inlet and discharge hoses from the fuel pump.
FUEL PRESSURE REGULATOR / THROTTLE POSITION SENSOR