[shorod]

Have your brother find a fuel pressure guage and keep it in the car with him. Next time it acts up, check for fuel pressure. If he can verify that there's no or insufficient fuel pressure when the car won't start, that will give him a place to start.

If he determines there is no fuel pressure, then he'll need to check for voltage to the fuel pump. If there is voltage to the pump, but no fuel pressure, and the fuel filter is not restricted, then chances are pretty good the pump is shot. The symptoms are consistent with a bad fuel pump, and since your brother's is a '94, the age would be reasonable that if he hasn't replaced the pump yet, it is probably overdue.

-Rod