Hi Jim,
For what it is worth, I've run nothing but a low volume/low pressure electric pump for around 20 years and it works just fine. The mechanical pumps you get today are junk. If you're putting an electric to run so that you can start easier, please follow Grigg's advice with the push button. If you want to use an electric pump and have a safety kill switch, I've heard of people running the wiring through an oil pressure sender. The idea there is when the engine is dead the pump will stop as soon as the sender sees no more oil pressure. Personally I have never done this and I don't really worry about it. One other thing...electric pumps are made to be pushers and not pullers, so you want it mounted close to the fuel tank. All of the ones you'll be buying for a 235 are anyhow. Here is one I've had good luck with and it isn't costly:
https://www.amazon.com/gp/product/B...sin_title_o04__o00_s00?ie=UTF8&psc=1It puts out about 2.5 pounds of pressure and that is fine. If a fuel pump is making your carburetor leak, you have one of two things and maybe both: a pump which is too strong or a carb with a bad float/needle/seat. Or as I said, you could have both. If you're running a pump with 10 psi, you really do not need that much.
