RE: not getting fuel 91 4.3 TBI
I'm thinking that you need to look further into the non-spray, and not the electrical issue. If your fully connected to the relays behind the glove box, and not getting a fuel pump whine, the ECM may believe that you have enough pressure to start. Thus not always sending a signal to the pump harness. I would make sure you don't have a clog in the filter, or with a leak-down test checking to see if the fuel that is in the TBI is leaking possibly into the upper plenum. I had a similar problem, and after a new pump found my FPR to be leaking and dissapating the 60psi needed to start. However this is only a home-schooled mechanics opinion, so trust the evidence.
Just get me there!