Hopefully just a connection that wiggled loose and can be fixed easily.
Having said that, I'm broke down right now because of similar problem. Noticed fuel dripping out. Had to drop tank and leak turned out to be a little black cap covering a hole (evap line?). It's 16 years old, so I replaced the sending unit. Now it's sucking air somewhere so tank has to dropped again:M. Of course this couldn't happen at home and the RV park we're in obviously won't let me drop tank, so paying $95.00 hour to have shop do it, and a tow bill.
If you have to pull tank, highly recommend a new suction tube by FASS (if vehicle out of warranty) My new sending unit, the straw is so weak. New sending unit has a cheap plastic suction tube on the new sending unit, so going with something heavier duty.
Also make a new fuel line and put in test port for low fuel pressure, could save big hassles later. That is if there isn't any way to check fuel pressure or gauge at present time.
http://www.fassride.com/shop/accessories/suction-tube-kits.phpSomething to ponder...Also hope your tank is pretty empty. Mine was full (35 gallon in a pick up). It was cheaper for me to give fuel away than buy 7 fuel containers.
Good luck