Not trying to question intelligence, but is there any chance the kill switch was activated without you knowing it? It has always been my understanding that activating that switch will kill the power to the fuel pump. I would think that would allow it to start by doing what you were doing, but then not run. That would be my first place to look.
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Paul
2007 Four Winns Horizon 220Mercruiser 350 Mag MPI w/ Bravo III Drive
2004 Ford Explorer Limited (V8-AWD)
Pomme de Terre Lake (Southwest Missouri)