So a dock neighbor had a generator fuel line "pop" out of the center top of the casement (my word?) into which he screws his fuel filter. The exposed end looks like a 1/4" aluminum hose barb that one would put, well, a hose on. This pushes into the top of the casement and stays put with a minor tug, but anything stronger it pops out again. Does anyone know how this barb should be held in place. I can't seem to find a diagram? The casement also has two lines coming into the filter head from either side, and they have the traditional threaded fittings.