Hitachi ZAXIS 130-6N Operator's Manual page 329

If Air Mixed Downstream of Common Rail
If air becomes mixed into the fuel system due to lack of fuel
and the engine is difficult to start, release air by following
the procedure below.
1. Following the above mentioned procedures, bleed
enough air up to the engine supply pump entrance.
2. Operate starter motor for long cranking within 20
seconds. If engine falls to start, return key switch to OFF.
Wait more than about 60 seconds, and then try again.
MAINTENANCE
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