Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Without actually being able to see this, the first thing that comes to mind would be a loose/cracked hose on top of the fuel tank - possibly even the tank itself may be cracked, especially if it is a poly tank.
Inspect the tank and hoses.
If you can't see anything obvious, make sure the tank is full, and take it around the block a couple times, then check again, to see where the wet spot is.
You should also not forget to check the fill hose and cap.
are you certain it was gas that was leaking, and not water running off somewhere? Maybe you had just had rain right before that, and some pooled water was spilling off the roof?
I would not coil it. I would hang it up higher.
If you coil it, and the coil is down to low, and gas does manage to get into the loop, it will create a vacuum block, and the genset fuel pump may not be able to draw fuel from the tank. The tank has to be vented.
I can not make any suggestions without being able to physically see it.