Since yuor putting a new tank in put new a fuel line and filter in.If you have any wore out gaskets you should relace them but you can also use a product called shelac made by permatex,i use it to replace head gaskets on quads to increase compression.it works great.
AutoZone.com | Shopping | Accessories | Product Detail - Permatex 2 oz. Bottle Indian Head Gasket Shellac Compound