Komatsu PC400LC-5 Operation & Maintenance Manual page 203

24. SERVICE PROCEDURE
8. After replacing the filter cartridge, start the engine and check that
there is no leakage of fuel from the filter seal surface. If there is
any leakage of fuel, check the tightening of the filter cartridge.
Whenever there is leakage of fuel, follow Steps 1 and 2 to
remove the filter cartridge, then check the packing surface for
damage or foreign material. If any damage or foreign material
is found in the packing, replace the packing with a new part, then
repeat Steps 3 - 6 to install the filter cartridge.
NOTICE
When the engine has run out of fuel, carry out the same
procedure and crank the engine for 15 - 20 seconds.
Repeat this operation 2 - 3 times to bleed the air.
Do not rotate the starting motor continuously for more than 20
seconds. Wait for 1 - 2 minutes before rotating again.
The time taken to bleed the air is shorter when the fuel tank is full.
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