1996 Jeep Cherokee trouble starting

The engine cranked but didn't fire. The plugs were getting ignition, poured a few ounces of gas down the intake and it fired for a moment but would not run. Pull the fuel pump from the tank, tested it and it worked. Replaced the fuel pump and it fired right up. Could I have a sensor problem and what should I do as it was obviously not getting fuel before I pulled the pump. Thanks. Norm