Sorry to hear about your recent truck troubles! The 2013 Ford F-150 technically does not have a serviceable fuel pump relay. However, you can replace the fuel pump fuse located at the front edge of the engine compartment.
To access the fusebox, simply pop the hood and look for a black plastic box mounted near the front of the engine compartment. Lift up on the two tabs on the front of the box, and the lid should come off.
Once you have the lid of the fusebox removed, the fuel pump fuse is in slot 27. It’s a 20-amp, yellow fuse located in the middle-left of the fusebox. If you’re not sure what you’re looking for, use the diagram that’s on the underside of the fusebox lid.