Hitachi ZW 370-6 Operator's Manual page 355

If Air Mixed After Common Rail
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WARNING: INJECTION HAZARD
Fuel under high pressure
High pressure common rail, high pressure lines fuel
lines and high pressure fuel injection lines contain
high pressure fuel.
High pressure fuel injection into skin can cause injury
or death.
Keep hands away from injection lines while turning
engine with starter or while running engine.
In case air mixed in the fuel system due to lack of fuel and
the engine is difficult to start, release air by following the
procedure given below.
1. Bleed air until supply pump (7) inlet sufficiently
according to the above-mentioned procedures.
2. Operate starter motor for long cranking within 20
seconds. If engine fails to start, return key switch to OFF.
Wait more than about 60 seconds, and then try again.
MAINTENANCE
7-61