52 Servicing Your Honda
Fuel System
Make sure the fuel remains enough (1.0 ℓ (0.3 US
gal, 0.2 Imp gal) minimum) in the fuel tank and
add fuel if necessary before increasing fuel
pressure.
1. Connect the fuel pump connector (1).
2. Disconnect the DLC/fuel pump sub harness
connector (2).
3. Before connecting the battery harness cables to
a 12V battery (3), make sure that the battery
harness selector switches (4) are OFF.
4. Connect the battery harness positive (+) cable
(5) first, then connect the battery harness
negative (–) cable (6) to the terminals of a 12V
battery.
5. Connect the battery harness adaptor (7)
between the battery harness (8) and the DLC/
fuel pump sub harness connector as shown.
• Battery harness 070MZ-MEN0100
• Battery harness adapter 070MZ-KRN0100
6. Position the fuel tank on the main frame.
7. Turn the “PUMP” selector switch (9) 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.
8. Run the fuel pump for about 3 – 5 seconds, and
fuel pressure will rise.
9. Turn the “PUMP” selector switch OFF.
Check that there is no leakage in the fuel line.
10. Make sure that the battery harness selector
switches are OFF.
11. Disconnect the battery harness negative (–)
cable from the battery first, then disconnect the
battery harness positive (+) cable.
12. Remove the battery harness and battery
harness adapter.
13. Connect the DLC/fuel pump sub harness
connector.
14. Install the fuel tank (page 39).
Fuel Pressure Increasing
(1) fuel pump connector
(2) DLC/fuel pump sub harness connector
(2) DLC/fuel pump sub harness connector
(3) battery
(4) battery harness selector switches
(5) positive (+) cable
(6) negative (–) cable
(7) battery harness adaptor
(8) battery harness
(9) “PUMP” selector switch
CRF450R.book Page 52 Thursday, July 8, 2010 9:34 AM
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