Ok, so for the first time since I've owned my Jeep, it wouldn't start today, Even though I drove to the store earlier no problem. So, I go out to move it to wash it and it won't start, thought it might be out of gas even though the fuel gauge was reading half tank earlier so I put some about 5 gallons of gas in it. Still no luck starting. Also, when I try to start it now the fuel gauge goes all the way up past full. So my question is is it the fuel pump that's causing it? I don't know a lot about cars but my dad knows a pretty good amount but even he isn't exactly sure. Any help would be appreciated.