Fuel System Air Bleeding - IHI IC75 Operation Manual

Fuel system air bleeding

If air enters the fuel system, it hinders the engine from
starting and cause engine troubles.
Be sure to bleed the air of fuel system, when the fuel tank
is emptied, water is discharged from fuel, or the filter
element is replaced.
1. Set the engine key switch to the ON position to activate
the electromagnetic fuel pump.
2. Loosen the air bleeder plug (1) of the main fuel filter.
Move the priming pump (2) (20 times or more) until fuel
comes out.
3. Tighten the air bleeder plug. Move the priming pump
(10 times or more) until the fuel filter is filled with fuel.
4. Wait for approximately 1 minute. Loosen the air
bleeder valve to bleed the air of fuel system.
5. Repeat steps 2 to 4 until no air is discharged from the
air bleeder valve. (Three times at least)
6. Tighten the air bleeder plug firmly. Wipe off fuel
around.
7. Start the engine at the idling speed.
If the engine does not start, retry operation from step 3.
8. Keep the engine idling for 5 seconds.
9. Increase the engine speed gradually and keep the
maximum speed for 3 minutes.
10. Repeat steps 8 and 9 several times.
Check if no fuel leaks from the fuel system.
Leaked fuel may cause a fire.
IC75 ENG
MAINTENANCE
WARNING
4-26