A couple of things to check. There were some trucks built in that are that fuel pump will not turn on unless there is oil pressure. It read off of the sending unit and a bad oil pressure sending unit would not let the fuel pump run. I can't remember off of the top of my head which engine combination it was that had that. I will have to look. Secondly check your grounds, my 1986 F250 had fuel pump issues and it was the same set up as yours and it was a ground problem. They ground thru the sending unit to the gas tank, and from the gas tank to the gas tank straps to the frame. The ground wire runs to the plug on the sending unit and just grounds to the sending unit body. If there is any rust on any of those they will not ground properly.
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