Engine Knocking; Fuel Supply System - VESPA GTS 250 I.E. Workshop Manual

Injection
Possible Cause
Fuel supply

Engine knocking

PRESENCE OF KNOCKING (OVERHEAD KNOCKING)
Possible Cause
Presence of faults detected by the self diagnosis
Ignition efficiency
Parameter reliability
Intake system seal
TPS reset successful
Fuel supply
Selection of the cylinder base gasket thickness

Fuel supply system

The fuel supply circuit includes the electric pump, the filter, the pressure regulator. the electro-injector
and the delivery and return pipes.
The electrical pump is located in the tank from which the fuel is pumped and sent to the injector through
the filter.
The pressure is controlled by the pressure regulator situated in the pump assembly in the tank.
INJEC - 14
Vespa GTS 250 I.E.
Operation
Fuel level in the tank
Fuel pressure
Fuel filter
Injector capacity
Operation
Pump relay
HV coil
Injector
revolution timing sensor
Air temperature
Coolant temperature.
Lambda sensor
Spark plug
Throttle valve position signal
coolant temperature signal
Intake air temperature indicator
- Ignition advance
Intake manifold
Filter box
TPS reset successful
Fuel pressure
Fuel filter
Injector capacity
Fuel quality
Selection of the thickness of the cylinder base liner