Ok so my fuel gauge started messing up today! I was on the way to work and it dropped to empty and the fuel light came on?! It has 3/4 tank in it. when I got off work and drove it around I noticed it would jump all over the place it would show 1/4 tank then empty 3/4 then empty.....etc, and just jump to different levels each time jumping down to empty. is this a common problem and what could be the problem?