Product Overview: 294050-0423 / 8-97605946-7 HP4 Common Rail Fuel Pump This HP4 high pressure common rail fuel pump is specified for the Isuzu 6HK1 7.8 litre engine in medium duty truck chassis and in the SY365H excavator rating. The pump figure 294050-0423 and the engine figure 8-97605946-7 are a matched pair, and both must be confirmed against the plate before ordering. Four separate calibrations serve this engine family, and they are not interchangeable. High pressure