Komatsu ecot3 Operation And Maintenance Manual page 335

MAINTENANCE PROCEDURE
Bleed the air as follows:
9. Fill the fuel tank with fuel (to the position where the float is at the highest position).
10. Loosen the knob of feed pump (4), pull it out, then pump it in
and out until the movement becomes heavy.
REMARK
It is not necessary to remove the plug at the top of the fuel
pre-filter and fuel main filter.
After the engine runs out of fuel, use the same procedure to
operate feed pump (4) and bleed the air.
11. Push in the knob of feed pump (4) and tighten it.
12. After replacing the filter cartridge, start the engine and run it at low idle for 10 minutes.
Check for leakage of oil from the filter seal surface. If any oil is leaking, check the tightening of the filter cartridge.
If there is still oil leakage, repeat Steps 1 to 4 to remove the filter cartridge, and if any damage or embedded
foreign material in the packing surface is found, replace it with a new cartridge and repeat Steps 5 to 12 to install
it.
(Machine of poor fuel arrangement specification)
REMARK
Sometimes some air is still left inside water separator after air bleeding, but the engine can be started by operating
feed pump (4) until its motion gets hard. The remaining air is naturally bled when the water separator is left as it is
for some time after the engine comes to a stop.
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MAINTENANCE