5 -46
5-15. General maintenance (When required)
(1) Air-bleeding from Fuel system
Air in the fuel system may cause weak injection or a failure of the engine start or stop. To prevent
such a failure, bleed the air from the fuel system.
Fuel injection nozzle
Fuel injection pipe
Fuel return pipe
High pressure pump
Fuel tank
Pre-fuel filter
Manual feed pump
Common rail
▶ HIGH PRESSURE FUEL. When the engine is running, do not loosen the fuel
injection pipes to bleed air from the fuel system.
Danger
Main fuel filter
Cooler
▶When changing the fuel filter only, it is not necessary to bleed air from the fuel
injection pipes.
Notice
▶ Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire.
To help prevent possible injury, turn the key switch off when changing fuel filters or
water separator elements. Clean up fuel spills immediately.
Warning
▶ Do not adjust or modify the fuel injection system arbitrary. It can cause a serious
fault related to engine performance and increase of excessive exhaust emissions.
▶ Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel
system component that will be disconnected. Fit a suitable cover disconnected fuel
system component. Do not fill the new filter with fuel. Invisible fine contaminants
can enter the injection pump and it may cause damage to the fuel injection system.
Caution
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