1995 Chevy Beretta Piston full of gas

After checking a leak on the number 4 cylinder injector, i removed the harness and popped out the injector and never relieved the pressure before hand. So as you can imagine the gas was everywhere. Now after reinstallation the number 4 cylinder fills with gas as soon as i turn on the key and power the fuel pump. What would cause this? Pressure regulator maybe??