To find the relay (or the controlling module), you'll need:
1. Your 2006 Ford Ranger's Repair Manual: This is the best resource. It will show the specific relay or module controlling the fuel pump and its location in the fuse box (usually under the hood or in the passenger compartment).
2. A Wiring Diagram: A wiring diagram (often found in the repair manual) is crucial to trace the fuel pump circuit and identify the relay. Online resources might offer diagrams, but ensure compatibility with your specific year and engine.
Without the wiring diagram, attempting to locate the fuel pump relay by trial and error is not recommended. Incorrectly identifying and manipulating relays can damage electrical components.