The leak is at the block/tank adjoining area. I'm using the plastic tank repair kit with some success. I have it on the seam though and didn't go the "tooth pulling" route. If this doesn't hold, I'll try that next. The palstic repir kit seems O.K. on the seam until it is moved enough to crack the sealer/repair goo. It get pretty hard and brittle once dry. I guess I'll try the "black crap" trick once I get frustrated with this fix. There is an airport local to me here that may offer some assistance. Thanks for the advise, any more is welcomed.