Gilera 633721 Workshop Manual page 224

Injection
Select the menu on the "ACTIVE DIAGNOSIS"
function.
Select the "PUMP DIAGNOSIS" function.
YES go to 2
2 - Enable the function with continuous power sup-
ply on and engine off.
The control unit starts the pump for 30 seconds
YES go to 3
3 - Let the system bleed for a few seconds.
Make sure that there are no external leaks.
Check the regulation pressure with pump power
supply voltage higher than 12 V.
Regulation pressure = 300 - 320 kPa (3 - 3.2 BAR)
YES go to 4 NO go to 5
4 - The pressure regulator is efficient.
5 - Pressure too high
Check that the return duct is not clogged or
squashed
YES go to 6 NO go to 7
6 - Replace the pressure regulator.
7 - Pressure regulation too low
Start the pump rotation again. Using pliers with flat
and long tips, temporarily clamp the return duct by
the extension of the specific tool (the serial pipe
does not allow this operation).
fuel pressure = over 300 kPa (3 BAR)
YES go to 8 NO go to 9
8 - Replace the pressure regulator.
9 - Replace the fuel pump.
Fuel pump and filter check
This procedure is useful during maintenance to check the filter efficiency in delivery.
Connect the diagnostic tester.
Connect the fuel pressure check kit.
Specific tooling
020460Y Scooter diagnosis and tester
020480Y Petrol pressure check set
INJEC - 224
Nexus 500 euro 3