My boat has a 55 gallon poly fuel tank. A couple of years ago I had to replace the fuel sending unit. Apparently I didn't tighten the screws all the way and eventually I started getting problems with water in my tank. The other day I replaced the unit and the screw holes are not in the greatest of shape. There is no working room under the deck to re-drill or tap new threads so I am limited to working with what I have. Anyway I have the screws as tight as I can get them and I tested it by pouring a few ounces of water around the unit. Over a period of a couple of hours the water is gone....guess where it is going? I was wondering if I pull it apart and use a gasket sealer on the gasket would the sealer work. What worries me is I know a lot of products are not compatible with polypropylene. Can anybody suggest a product that would be good for this application?
