The repair tester is designed to perform repair tests for different type of Electronic Unit Injectors(EUI) and Electronic Unit Pumps(EUP). The tester consists of a mechanical cam box with specified EUI/EUP adapter kits and electronic controller. The cam box will be driven by a standard high pressure fuel injection pump test bench. The EUP/EUI being tested will be installed in the cam box with the adapter. The electronic controller provides signal to drive the EUP solenoid synchronous with cam shaft rotation. The EUP fuel outlet is connected through high pressure fuel line to an injector. The EUP fuel injection quantities can be checked at given speeds and loads to judge its quality.