Benelli TNT125 - Fault Diagnosis of Fuel Pump Assembly; Disassembly of Fuel Pump Assembly

disassembling fuel line, in order to avoid the risk
of occurrence, the blocking device at the fuel pipe
should be used for blockage.
 After maintenance is completed, please ensure that
the fuel line and clamp are properly installed.
 After maintenance is completed, check system oil
leakage according to the provisions of “Fuel
Leakage Check Process”.
 After maintenance is completed, connect the
negative electrode of storage battery, please ensure
that there is sufficient fuel in the fuel tank when
the fuel pump is running.
Fault Diagnosis of Fuel Pump Assembly:
Step
Operation
Yes
No
1
After ingnition key
is started, fuel pump
will run for 3 seconds.
If you can hear that the
fuel pump is running,
please go to Step 4
directly.
If you cannot hear that
the fuel pump is
running, please
conduct Step 2.
2
Disconnect the connector of fuel pump, and
check whether the supply voltage of fuel
pump is within the range of 10-14V
Conduct Step 3
Check the power
supply circuit of fuel
pump
3
Supply 12V DC current to fuel pump.
Ensure that there is sufficient oil in the tank,
to prevent dry running of fuel pump
Is fuel pump running?
1. Check the circuit
from fuel pump to ECU
2. Check ECU
1.
Check fuel pump
harness
2. Check fuel pump
4
Check whether the front fuel supply
pressure of nozzle is within the range of
220-270kpa when engine is in idle running.
Fuel pump assembly is
running normally
Conduct Step 5
5
Detect whehter fuel pipe way pressure is
less than 220kpa using oil pressure gauge.
1. Check whether there
is leakage at fuel pipe
joint
2. Check fuel pump
position
3. Check pressure
regulator
1. Check whether the
fuel filter is blocked
2. Check whether fuel
pipe is bent and twisted
3. Check pressure
regulator
Disassembly of Fuel Pump Assembly:
 Refer to “Fuel Pressure Release Process” to
release the fuel pressure in the fuel line.
 Disconnect the negative electrode line of storage
battery.
 Disconnect fuel pump assembly harness
connector.
 Remove the remaining fuel from the fuel tank and
store it in a suitable container, to ensure safety and
reduce contamination.
 Remove the fuel tank from the motorcycle.
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