OG, a short shaft, now that's funny, I don't care who you are!
I'm assuming, which I shouldn't do, especially since I don't have the Cummins Onan, that since the fuel station pumps pumps down to near dry, so would the genny. I have read that it does, no experience. Rule of thumb, a tank should not be ran dry since there is trash on the bottom (sorry stating the bloody obvious). Even when I empty a small can into the mower (for instance) the last splash goes elsewhere, if there's chance its dirty.
This begs the question, "why would you need the genny to run out of fuel, but save some for the fuel pump (for toys)? Maybe post a new thread and see how many members know if they can use the entire tank, via the genny?
XLR Hyperlite 29HFS
Ram 2500 6.7L CTD
A Modder's work is never done!