How do I get gas out of the gas tank on a 1994 f-150

Syphon the gas out , but why do you have to take the gas out ?
Tick

Siphon it out or disconnect the fuel line and use the fuel pump to pump it out.

My front tank does not work and the tank is full so I wanted to put that gas into the rear tank till I have time to figure out why it doesn't work