i had a similar problem, i replaced the fuel pump but it kept happening, so i took it to get checked, they said it was the fuse ,replaced the fuse and havent had a problem since

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1994 XLT Ext. Cab. 4.0
Mods, front to back:
Garage Pro grille guard, Manual locking hubs, 2" coil spacer with 1/4" add a leaf, Sony Xplode 12" subwoofer, 31x10.50 General Grabber AT2's, 1 in 2 out Flowmaster Super 44 series