Hi, so my car started perfectly fine yesterday morning, I let my car sit for about 6 hours, I get in the car and the battery is completely drained. I replace the battery with another one I had and the car cranks but wont start. Now I dont hear the fuel pump prime. Could there be a short in the fuel pump that made the battery drain?

 

Sounds like your main relay. It could have burned the contacts and shorted to ground.

 

As said already, probably the main relay. I'd try changing it and see what happens!