![]() ![]() The neck is the highest point in the whole system, and in the AN6 return line between the fuel pressure regulator and the neck, there is nothing- and certainly no non return valve. I arranged this with an apprx 4” long brass pipe routing the fuel out of the bottom of the neck, and spilling it into the fuel. Like you’re planning, I have my return system dumping the fuel in the tank neck coming out in the fuel spill tray. However, I have been flying my Sonex behind aftermarket efi systems since 2011- and my present 120hp EP915ECI is no different: they all require a fuel return system to the tank. I know nothing about the efi system Rotax supplies with their engines, but I have seen their diagrams. Who knows of a explanatory example? And of a particular type/capacity/. There's more going on, some kind of parallelism in lines of the circuit. When I look at schematics of examples of such circuits I can't fully understand them because it's not just a single path: source, fuel line, one-valve, fuel line, tank. ![]() Rotax recommends such a circuit but does not detail one or provide one. This circuit requires a backflow cutoff - a one way valve - to prevent fuel coming from the tank into the return circuit. The excess fuel returns to the fuel tank. As with many/most fuel injected engines, Rotax 912i, 914 & 915T require a return circuit of excess gasoline - not delivered by the injectors. ![]()
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