A 0 to 15psi fuel pressure gauge [$20 plus $10 adaptor] would help analyzing this problem and future issues, look for steady 2 to 4psi. Considering the PO's probable maintenance knowledge I would not be surprised if you should get a new fuel pump. A harbor friend had a similar problem, called Moyer for advise and fuel pump and was suggested to quickly go to local auto parts store, get an inexpensive electric "posi flow" style [most brands incorporate "42S" for the right pump in label]. It fixed his shutdown problem for short term and later ordered upgraded to the Moyer Facet pump. Also check the tank for fuel supply/gas quality/water at the bottom etc.
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