VESPA GTV 250 i.e. 2008 Service Station Manual page 172

Injection
mote control disconnected, that the Black-Purple
cable (pin 20 on the interface wiring) is insulated
from the ground.
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. Prepare a graded burette with flow
rate of approximately 1 L. Rotate the pump using
the active diagnosis of the palm top computer. Us-
ing a pair of long flat needle-nose pliers, choke the
fuel pipe making the pressure stabilise at approx.
2.5 BAR. Check that within 15 seconds the pump
has a flow rate of approx. 110 cm³.
Specific tooling
INJEC - 172
Vespa GTV 250 i.e.