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On mine there were three lines and three returns. Engine generator and aquahot

I did identify the generator feed and return but had not thought about the aquahot. Does the aqua hot have a return line, I never really paid attention to mine? I think I do remember two fuel lines at the aqua hot. I know the 1/2” green line does not go down into the tank, it’s just a connection to the very top of the tank, no pickup tube. If I have time next time I will take a look closer at the 1/2” green line, would be kinda neat if it was a priming system.