ORIGINAL: mtwister
True, pumps can be a hassle if you have not messed with them much. The reason I chose to pump this plane, is because there is more than 12"s from the carb to the back of the tank, and what that relates to is the engine will start to sag out, and sometimes lean out when you get below half a tank of fuel while pulling high alpha. So, for the 1st half of the flight on a plane like this you can tear it up and do your 3D stuff, but after a half tank you need to be careful. On a pumped engine, or a gas engine, the flight charateristics stay the same from start to finish. I've been there done that on another 25% Cap that had a tank that was mounted far back like this one is.
ORIGINAL: bubbagates
Just the 1/8th inch line will be just fine, been there, done that on many OS160's. On large glow engines you should be using 1/8th inch line anyway. My theory is small 26cc gas engines use 1/8th inch lines and they use half the fuel amount that a glow in that size will use, so why not. It's not much more than the standard size and way less complicated than trying to get the perry pumps setup right.
And I understand your reasoning and I'm not trying to start an argument here. I've been using the 1/8th inch line on tanks as far back as 12 inches for a long time and on this plane I have witnessed one do it and another that will be doing it not to mention using it on the Gene Soucy Extra myself with the tank about the same distance, the CH CapX and a few others and every time the 1/8th line worked just fine. The key is to use "standard" line on the pressure line back to the tank. 1/8th inch line back to the tank will not give you the pressure you need and it works with either brand of pitts muffler.
Maybe I've just been lucky