Honda CRF450R 2009 Owner's Manual & Competition Handbook page 50

Fuel System
Fuel Pressure Increasing
Make sure the fuel remains enough (0.3 US gal
(1.0r) minimum) in the fuel tank and add fuel if
necessary before increasing fuel pressure.
1. Connect the fuel pump sub-harness connector
(1).
(1)
(1) fuel pump sub-harness connector
2. Before connecting the battery harness cables
to a 12V battery, make sure that the battery
harness selector switches are OFF.
3. Connect the battery harness (2) between the
main and sub-harness as shown.
Connect the battery harness positive (+) cable
first, then connect the battery harness negative
(–) cable to a 12V battery terminals.
070MZ-MEN0100
• Battery harness
44
Servicing Your Honda
BATTERY
(2) battery harness
4. Position the fuel tank on the main frame.
5. Turn the "PUMP" selector switch (3) ON.
The selector switches can be used to change
power delivery as follows:
– "ECM" selector switch ON:
Power to ECM only.
– "PUMP" selector switch ON:
Power to fuel pump only.
– Both selector switches ON:
Power to ECM and fuel pump.
6. Run the fuel pump for about 3 – 5 seconds,
(2)
and fuel pressure will rise.
7. Turn the "PUMP" selector switch OFF.
Check that there is no leakage in the fuel line.
(3)
(3) "PUMP" selector switch
8. Remove the battery harness and install the
fuel tank (page 35).