That's one of the things about our engines that make them such a pleasure. Tank location has zero impact on engine performance when kept within a rather wide range of allowable locations. Essentially if the tank can be installed anywhere in or on the lane the engine will function the same.

A non-pumped glow engine will experience gravity feed performance issues but that is very difficult to develop in our planes. I've seen a lot of vent tube installations that generated numerous problems. Never install a vent tube unless first determining there is absolutely a need. An improperly installed, restricted, or excessively long vent tube delays or alters the pressure sensed by a diaphragm until long after the aircraft has passed the point the engine needed the information. For a period of time there was, and likely still is, a lot of people that were automatically installing a vent tube when they installed an engine. Somewhere, someone said a vent tube eliminated a mid range burbal. That same person probably forgot to let people know they could also cause one, along with a few other irritating issues.