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Fit the pressure gauge to the petrol circuit, between fuel pump and fuel rail
To discharge air from the circuit:
- switch to "ON"
- nudge the starter motor so it switches on momentarily
- the pressure of the fuel circuit should be 2.5 ± 2.0 bar
- switch off
- now the pressure gauge can be fitted
Switch to "OFF"
Is the pressure 2.5 bar?
NO
YES
YES
Does the pressure stay at
7.5 bar on "OFF"?
YES
NO
aprilia
(DOUBLE CHECK THE MALFUNCTION BEFORE REPLACING ANY PART)
CHECKING THE PRESSURE OF THE AIR AND FUEL CIRCUITS
Does the starter motor for the pump start
up? Can you hear the characteristic buzz
when you switch on?
NO
YES
Does the pressure stay at 2.5 ± 2.0 bar?
NO
YES
Check the pump pressure blocking the
delivery hose below the pressure gauge.
Is the pressure 7 bar?
N.B. Do not exceed 7.5 bar, or the pump
will be damaged.
NO
Blocking the delivery hose above the pump,
does the pressure remain?
N.B. Do not exceed 7.5 bar, or the pump
will be damaged.
NO
YES
Replace the petrol pump
Check the power at the pump connector. If the voltage is
correct, replace the petrol pump.
N.B. After replacing the pump, start up as specified
above (point 6 of Troubleshooting the Injection)
Check:
the tank breather
the petrol filter and tank delivery flange
the fuel feed hose
- Start up as specified above (point 6 of
Troubleshooting the Injection)
Replace the fuel pump
Check the hoses and replace the Fuel Rail if necessary
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