1996 Buick Regal Is it the fuel injector?

The car started acting up a while ago, first it stalled out like it was out of gas, the fuel gage registered 1/4 tank, but when fuel was added, car ran fine. Next it started to loose power when the a/c or fan was on and the car accellerated, last the car stalled out with more than 1/2 tank and will not start. The engine turns over and catches for a few seconds and then quickly dies. The fuel filters near the tank and in the engine checked out fine, when the fuel line was disconnected from the engine but the key turned to auxillery power, gas flowed. The engine does not seem to be getting fuel, is my fuel injector bad? Now we just want the car to start long enough to either trade it in or sell it privately. Thanks.