BUMP!!!!!

Well I now have a new problem with the truck. It won't start now. I have no lights on the instrument cluster and the gauges don't move. It will start just until you release the key and then it dies. I do have power though as the headlights work and the radio comes on.

What happened is I was driving to the store and the check engine light came on. When I got to the store I checked everything over and it was fine. Started it up and drove home and the engine light was still on. So I took and checked all the fuses and they were all fine. Then when I went to go to work it would not start. I took and bought a code reader and it comes up with one code. P1643 and the book says "Fuel pump PWM Control circuit (except 5.7L VINs P & 5).

All of your help is greatly appricated!