Different with CRDI and EUI EUP injection system, The core feature of the HEUI system (Hydraulic Electronic Unit Injector) is the use of engine oil as the hydraulic medium, combined with electronic control and hydraulic actuation to achieve high-pressure fuel injection.
Due to its unique working principle, in order to test the HEUI injector, a HEUI pump is required on the diesel tester to generate oil pressure. The HEUI test fixture and injector adaptors are also unique.

HEUI testing fixture and HEUI adaptors, applicable to CAT C7, C9, C-9, 3126B, 3412E, FORD G2.8, G2.9 and ISUZU.