BTDT! It started leaking on a trip while about 500 miles from home. I managed to cobble together a patch and then bought the cute little piece of hose with plastic plug. That was about 1988, I think they have a one piece plug now.

I probably lost a quarter tank of fuel before figuring out what was going on. I am quite sure that a LOT more fuel comes out that plug than is burned in the engine, that is if it is totally gone and not just dribbling.