VESPA 633844 IT, Service Manual

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control unit disconnected and the injection load re-
mote control disconnected, that the Black-Purple
cable (pin 20 on the interface wiring) is insulated
from the earth.
Specific tooling
020331Y Digital multimeter
Circuit leak test
Install the appropriate tool for fuel pressure control
with the pipe fitted with the pressure gauge on the
delivery pipe..
Check during regular operation by placing the ap-
propriate tool between the pump and the injector.
With the battery voltage> 12 V check that the fuel
pressure is 2.5 BAR and that the input current is
1.4 to 1.8 A
With the battery voltage > 12 V, check the pump
flow rate by disconnecting from the injector the
pipe equipped with the pressure gauge of the ap-
propriate tool. Make a graded burette available
with a flow rate of approximately 1 L. Rotate the
pump using the active diagnosis of the palm top
computer. Using a pair of long flat needle-nose
pliers, choke the fuel pipe making the pressure
stabilise at approx. 2.5 BAR. Check that, in fifteen
seconds, the pump has a flow rate of around 110
cm³.
Injection
Vespa GTV 250 i.e.
INJEC - 20