so if you want to be able to spray the injector when you want. say your making a flame thrower, I would drill a hole in the top of the pipe that you are using big enough for the jet to fit in and then connect it to power using a 9v battery pack that you can mount on the pipe somewhere, then when you run your ground put a single pole single throw switch in there so you can control your ground with a switch. so when the switch is turned on it will complete the circut and you can pump fuel through the injector.