The front tank went out & I would like to check the fuel pump relay before I replace the entire fuel pump. I am having a hard time finding the relay. Where can it be found on my truck?

Fuel pump fuse and the fuel pump relay are usually located in the under hood fuse/relay box on F-150s. This link may help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post252145

It should be located pretty close under the hood to the air filter that's where mine was