I've never had great luck with pumps and I'm sure that's my own fault. Where I've had problems is the pump always provided too much fuel to the engine, causing it to easily flood. I too thought I would be adding reliability to the engine performance. In fact, all I added was problems. In the first place, My application did not "require" me to pump the engine. I now believe that you don't add a pump unless it's required as to supply fuel to the carb. As stated in other responses, pumping and engine that doesn't need it will cause adjustment problems. Well, maybe not quite stated in that way, pumping does add some differences in carb adjustment. Keep in mind, there is an adjustment screw on the pump itself. (Perry) Now you've added a third adjustment that has to be right for the engine to run correctly. It's easy to cause a flooding problem when using pumps, certainly in an inverted engine. The on board glo igniter sounds like a better way to go with your application. Pumps are great when needed, but if tank location is within required limits of the carb, I wouldn't use a pump. Happy flying!