Gilera 633721 Workshop Manual page 232

Injection
- Remove the pump mounting washer
- Remove the filter coupling pipe
- Remove the pump with annular support and pre-
filter.
- If the pump requires replacement, remove the
pre-filter and the annular support.
- For reassembly, perform the removal operations
but in the reverse order using a new clamp for the
delivery pipe and a new pump mounting washer.
N.B.
TO CLEAN THE PRE-FILTER, USE PETROL AND COMPRESSED AIR.
Orientate the pump properly.
INJEC - 232
Nexus 500 euro 3