When I am on my feet for any amount of time my left foot feels like its on fire and if I raise the foot off the floor it goes away slowly?

Leg/foot pain. Burning pain in the feet/legs can be a sign of poor vascular perfusion and should be evaluated by a vascular surgeon with some urgency. Other causes might be muscular, neurologic, or joint-related. Depending on other factors, a DVT could be possible as well. Best to have an examination.
Burning foot. This may be nerve related. Should be evaluated for nerve entrapment versus other pathology.
Need more info. Need to know what part of the foot. It may be a compressed nerve & wheb you remove the pressure it allows the nerve to transmit properly.