Gilera 633721 Workshop Manual page 225

Nexus 500 euro 3
1 - Select the diagnostic tester menu on the «AC-
TIVE DIAGNOSIS» function.
Select the «PUMP DIAGNOSIS» function.
The pump starts for 30 seconds.
YES go to 2
2 - Let bleed for a few seconds.
Make sure that there are no leaks.
Using pliers with flat and long tips, temporarily
clamp the return duct by the extension of the spe-
cial tool with pump power supply voltage higher
than 12 V, check the system maximum pressure.
Maximum pressure = > 600 kPa (6 BAR)
YES go to 3 NO go to 4
Specific tooling
020480Y Petrol pressure check set
3 - Check the system seal.
Start the pump for 30 seconds using the diagnostic tester.
When the pump stops, wait 3 minutes.
Check the system pressure.
Fuel pressure = over 200 kPa (2 BAR)
YES go to 5 NO go to 6
Specific tooling
020460Y Scooter diagnosis and tester
4 - If pressure is lower, carefully check the voltage
with pump under stress.
If voltage is higher than 12 V, replace the pump.
5 - The system seal is efficient.
Check the free flow rate.
AHEAD go to 16
6 - Repeat the test. When the pump stops, use pli-
ers with flat and long tips to temporarily clamp the
return duct by the extension of the special tool.
This causes an increase of the fuel pressure.
AHEAD go to 7
Injection
INJEC - 225