ok got a question and it only happend once but i wanna clear it up just in case.

i took my 88 s10 blazer around the block before i park it for the night and i get around the corner and the car shut off motor only. so i put in park and crank it and it dose not start right away then finally it starts. put it in drive then dies again. so im like wtf. crank it again it starts then i drive it home just fine no probs. any ideas. i replaced the fuel pump a while back so idk felt like fuel supply got shut off for a min thats why it shut off. any ideas?