Wiring priming fuel pump

I purchased an inline electric fuel pump for the sole purpose of priming the carb when the car has been sitting for a week or two and all of the fuel has evaporated. I was thinking I just needed a momentary switch with two connectors to complete the circuit. As I usually do, I have been overthinking this and figured I should run an on-off-on switch which is momentary on one side and fixed on the other side. My thinking is that I would use the momentary side for priming, but in case the mechanical fuel pump ever fails, I could just switch the pump on. I don't have a great grasp of electrical wiring, so here is my question. The on-off-on switches I am seeing have three connectors instead of two. How would I wire it? I suppose the simpler alternative would be a regular two connector on-off toggle switch, and just turn it on long enough to prime the carb?