ISUZU 4HK-1 and 6HK-1 Engine Fuel System

Most HITACHI Excavator utilize  ISUZU Engine  with model  4HK-1  and  6HK-1,   which adopt   EFI  -  Electric Fuel Injection.

The ECM ( Engine Control Module )  regulate the opening/closing period of common rail pressure valve and the electric activation of each injector,  to achieve optimum injection timing & amount.