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I would still test it to see if it siphons and I would supervise aux fueling operations. Floats stick, sensors fail, and overflow makes a mess. For my situation there's not enough return on investment to leave it on auto.

>since my storage tanks are higher than the gen tank... Depends on what aux fuel pump you've got and the height differential. I found that my setup would siphon after turning the pump off, resulting in overflow. I supervise aux fueling and break the hose connection at the high point when done.