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I'm at a point where I have to decide what engine I want to install in my Cruzer. Unfortunately, my wings are complete and I capped off the fuel return line inlet on each of my fuel tanks thinking I was not going to install a fuel injected engine and would not need this. Now I'm told the Rotax 912ULS with its two carbs needs a fuel return line. Question - Does the Continental 0-200 require a fuel return line as well?
MAC (who would like NOT to open up the wings and re-plumb the fuel tank)
Unless you had plans to convert the O200 to fuel injection a return fuel line is not required.
By adding a couple of access ports I think retrofitting a flexible stainless steel wrapped teflon fuel line back to one of your tanks is doable. Also consider a header tank. Here's one fabricated by Skytek in Canada specifically for the injected Rotax, would work just as well for 912 ULS model: https://store.skytekaircraft.ca/store/p1/Header_Tank_Assembly_Kit.h...
Viking engines also sells header tanks. Actually they sell all different stages of a fuel system. Sorry I don't have a link.
O-200 does not require fuel return line.
There are a few good carbureted engines available that do not require a fuel return. The Corvair, the Continental O-200, the Lycoming and the Jabiru 3300.