PIAGGIO 500 cc Service Manual page 163

Fuel injection
Rate variations are not evaluated
Repeat the test by squeezing the tube of
the special tool 020480Y in the tract be-
tween the derivation and the injector.
Check if pressure reduces at the same rate
as when the system is free.
The pressure reduces much more slowly
Proceed with controls and possible replacement of
the injector due to insufficient seal
(see page 9-62 and Chapter. 7-THERMAL UNIT
AND TIMING SYSTEM).
Rate variations are not evaluated
Repeat the test by squeezing the tube of the
special tool 020480Y in the tract between
the derivation and the injector. Check if
pressure reduces much more slowly.
YES NO
9
Check seal of the tubes and the injector.
The unidirectional pump valve is defective
joint more accurately.
Replace the pump (see page 9-54 - overhaul
If necessary repeat seal controls of the
of the pump support).
components.
NOTE: poor system seal only prejudices readiness at ignition stage.
9 - 51