I have a 1999 F-250 superduty 4X4 with 7.3. y ruck died on me the other day while driving down the road. I had it towed home. I checked the fuel kill switch it was fine, checked fuel filter in ok shape, checked fuel pump no power getting to it, pulled it and hooked it up word good, changed relay in dash behind radio, still no power to pump any ideas would be appreciated.