The dripping or fuel puddle problem you have is because the regulator is not closing. Why is it not closing I don't know. It could be some dirt or debris in the plunger seat that is keeping it open. It could be a deformed diaphram that not putting the right pressure on the plunger to help it close. It could be that the regulator is just set too rich. It could be a problem with the plunger.

Lots of options here, but its leaking fuel becasue the regulator is not closing off.

Troy Newman
Team YS