What is a Cummins PT test bench used for? A Cummins PT test bench is a specialized diagnostic stand designed to test, calibrate, and troubleshoot PT (Pressure-Time) fuel systems. Unlike common rail or unit injector systems, PT fuel systems rely on fuel pressure and injector open time to meter fuel. The test bench simulates engine operating conditions—such as fuel temperature, pressure, and flow—to verify components like the PT pump, injectors, and AFC (Air-Fuel Control) devices before they go back on an engine. https://www.cq-longshine.com/cummins-pt-test-bench