A surge chamber configured for releasably connecting a fuel injector to a fuel injection testing machine in an adjustable manner to accommodate the various fuel injector orientations produced by different manufacturers. The apparatus generally comprises a surge chamber receiving a quick connect assembly that is connected to a coupler adapted to connect to the fuel injector being tested. The chamber comprises a swivel cap that permits rotation of the chamber about its longitudinal axis. Such rotation may be desirable where the fuel injection inlet does not connect to the fuel injector at a 90-degree angle, or where the configuration of the fuel injection testing machine requires the injector to be oriented at a certain angle to properly engage a spray chamber.