1995 Chevy S-10 fuel inlection

I broke a fuel injector and replaced it with one from a 1995 4 cyl chevy cavalair. I tried 2 different injectors and the cylinder and intake manifold fill with gasoline. I cant crank the engine. I checked and all the 4 cyl 2.2. Ltr engines use the same injector. Could I have messed anything in the electrical system that would make the injectors open when I turn on the key. The fuel pupm rums about twice as long as it used to. Could one injector I chaned cause this.