If you have an RV8 or GPI pump, try loosening the 4 bolts that hold the pump gear cover on. Loosen them just a turn or two, so you don't leak gas, and then turn the motor on. If this is the first time it has quit, usually that will let you pump fuel. Then you better order some gears. I just talked to GPI last week because I tried the sanding trick that I read about on here, and must have taken too much off the gears, and they wouldn't work at all. Called GPI and they are shipping the repair kit out at no charge! I tried sanding the sides of the gear, but the swelling was causing more friction in the pump from the top of the gear teeth hitting the pump case and each other while meshing together, so when I tried sanding the top of the teeth for better fitment, I took off a smidge too much and it wouldn't pump at all. Unless your pump is way lower than your tank, you should only get a bit of gas that is in the line to leak out when you pull the cover. Mine pulls the fuel out of the top of the tank. If it wants to keep flowing, crimp the rubber suction line gently with some vice grips.
http://www.gpi.net/fuel-products/Spares/