Fuel Gauge Problem has me going WTF!?!?!?

[rxm6]

My fuel gauge is now extremely slow at registering fuel. I once filled it up and drove it for 45 minutes before it read the correct amount. It doesn't seem to have a problem lowering, its just when I fill the tank. What could this possibly be???!!!

I should mention, I did mess with the dash a couple times, but I was very gentle and I never touched anything I shouldn't have. I was just replacing bulbs. So if its me what did I do? Or is this just the fuel sender going out?

[MinisterofDOOM]

Do you know if it's still accurate (you said it has no problem dropping...does it show empty before the tank actually drops that low)? I suspect the sensor/sending unit and float attached to the fuel pump.