Ok so I have asked a few questions here and gotten good advice so here goes. I have a 1986 350 4x4, it will start cold no issues runs great. Once you run it for a few minutes and shut it down it will not start back up. Checked the fuel pump during this condition to find no voltage coming to the pump. I replaced the fuel stop relay and that didn't correct the issue. I am leaning towards a bad CDI box but wanted some input from some of you that may have experienced the same issues. I think my issue is no signal coming from the CDI to the relay to pull it in for the fuel pump once it has built up a little heat from resistance. However before I start spending money throwing more parts at it I wanted some more experienced opinions.