Low LP/Propane pressure

I just got back to the midwest after 3 weeks out west where everything worked as it should. My fridge is running fine off of lp however the lp port at the rear seems to be having some issues. Whether I use the small stove in our outdoor kitchen or my 3 burner campchef off that quick connect, both seem to have a low and lazy flame and at least 1 of my 30lb tanks is full. Any ideas? Is there a way to easily blow that line out?
Thanksk