Gilera Runner Purejet 2007, Workshop Manual, Page: 164 / 257

The fuel pump is a piston type supplied with a constant current motor. It was designed to supply high
pressures with small capacities and low absorption, and is therefore suitable for use on reduced capacity
motors. Given the low absorption, the pump is directly supplied by the ECU without the use of remote
control switches. The pump is fed for 4-5 seconds after the switch is turned "ON", this enables the circuit
to be drained and the old fuel to be draiend from the boiler inside the injector supports. Successive
pump management will be in combination with the with the presence of the revs phase signal. This
guarantees the safety of the vehicle in the case of an accident. The ECU auto diagnosis also checks
the pump's electric circuit. An anomaly is recognised in the case that a circuit is interupted or if there is
a short circuit. The anomaly is recognised with priority level 3, which means that it is registered by the
auto diagnosis but not indicated by the ignition of the injection warning light. This anomaly naturally
leads to a lack of motor function and is easily recognisable on an acoustic level by the lacking pump
rotation.
1- Switch to the «ON» position. Listen for activation of the pump for 4-5 seconds
YES point 3 NO point 2
2 - Proceed with the auto-diagnostic and control circuit checks.
3 - Check whether the pump activation starts up again when trying to start the engine.
YES point 4 NO point 5
4- The pump control circuit is efficient.
5- Check the auto-diagnostic and the phase - rpm signal.
6- Connect the scooter diagnostic tester Select the «active diagnostic» function
GO TO point 7
Specific tooling
020460Y Scooter diagnosis and tester
7- Check that the tank is adequately topped up and proceed with the activation of the «fuel pump»
diagnostic. Listen for 10 consecutive activations of around 4 seconds of the fuel pump. Check the
outcome on the diagnostic tester.
YES point 8 NO point 9 NO point 10
8- The fuel pump was activated 10 times and the tester returned the «test successfully completed»
outcome. The pump and the relative circuit are currently efficient. For greater certainty, proceed with
the auto-diagnostic check in order to highlight any errors in stored status.
9- The pump remained inactive and the tester returned the «test failed» outcome. Repeat the diagnostic
and, if necessary, replace the ECU.
GO TO point 7
10- The fuel pump was not activated and the tester returned the «test successfully completed» outcome.
Proceed with checking the pump and the relative electric circuit
11- Connect the scooter diagnostic tester, select the «errors» function. Check for the presence of error
PO230 FUEL PUMP .
YES point 13 YES point 14 NO point 12
pure jet injection
Runner Purejet
INJ PJ - 164