I think the LP fittings are the stupid saginaw type that also have an o-ring, just like the power steering lines that connect to the steering gear.
If one wants to just use fuel hose you can use this fitting coming out of the LP and then just run fuel hose to the FFM
I personally like the idea of cutting off the stupid fitting, adding a tube nut FIRST then re-flare the hard line to accept a regular -AN flare fitting. Plan on trying this out on the sending unit of the future dump truck since I won't be using the stock LP and the draw straw kit I used on my pickup is now $125, no thanks.