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Clean the old one out thoroughly.
Use a paint stripper gun and pieces of HDPE plastic which is the plastic used on these tanks and also used on oil jugs etc. I use black oil jugs so the color is the same. Work slowly, heat the area that has the leak than place patches cut from the same HDPE plastic. Heat the patch until it melts on the area and let it air cool slowly. Works like a charm. I've done it on a number of plastic tanks, never leaked again.
I had to mod the bottom of a CRF450X tank to clear the tall head of an air cooled motor I install. A good 2~3 inches. Worked out great, a lot of work but worked out.
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