[youngrodder]

This is a pretty common occurrence.

Sounds like you need to bleed the air out of your system. If you Google "bleeding power steering" you can find all sorts of write ups. Basically with the truck off (not running) and the front wheels supported off the ground, you keep turning lock to lock slowly. With the cap off your reservoir you will see the bubbles from the air escaping the system. Repeat until you see no bubbles/air.

Thanks
Marc