Check The Free Flow Capacity - PIAGGIO 500 cc Service Manual

Fuel injection

Check the free flow capacity

Disconnect the pump connector, start the engine,
wait for it to stop, reconnect the connector.
Disconnect the fuel return duct from the pump
support (left hand tube).
Insert the return duct in a measuring container.
Using the diagnosis tester 020460Y, activate the
fuel pump for 10 seconds.
Ensure that feed tension is greater than 12 V.
Measure the quantity of fuel distributed.
Free flow capacity of the pump = 300 - 320 cc.
YES
NO
The flow capacity is lower than 250 cc.
The fuel filter is not clogged.
It is possible to continue using it respect-
The fuel filter is dirty. Proceed with replacement of
ing the 48000 Km limit.
the pump support (see page 9-54).
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