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Hello everyone! Been a member from the first day I purchased my 1989 Seabreeze (National and Toyota) in 2014. First time to post but enjoyed a lot reading the posts. I recently moved to Portland OR and I am looking forward to meeting some owners in parks. I had some miss fire problem after purchase. It turned out to be the blocked fuel injectors due to long term (2+ year) storage of the RV (rust in the fuel tank) and failed fuel filter. Luckly, my mechanics fixed them and it has gained a few thousand miles without any problem. During the trip with miss fire issue, the hot muffler pipe (the holding clamp was broken) became in contact with the black water tank and burned large holes (~10 in long and 1 inch wide) as shown in the pictures. Based on my limited research, the tank is probably made of polyethylene and my two options are 1) plastic welding or 2) tank replacement. I have not asked quote yet. Could anyone provide some suggestions which way I should go? I looked at tank a few times when getting to underneath the motorhome. I am not confident that I can DIY. If I buy a replacement tank, where can I find one? Thanks for reading.