I'm in Phase I on my -9A so this is the first I've had much fuel in the tanks. It appears I have a leak around the fuel sump from the staining on the ground and near the flange. I'm confident it isn't the sump drain itself as the staining goes beyond and onto the flange t. I'm suspicious the VA-112 Drain Flange is where the leak is occurring. I haven't determined if it is a single rivet or the flange to skin seal that is leaking. I am guessing the Pro Seal has a failure point. Is there any way to repair this without removing the tank? A 1/4 in hole is pretty small to get something in there to do any good. Input from the Brain Trust? TIA