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Can I change the gas tank on a fuel injected Harley Sportster?

Im looking into buying a Harley Davidson Sportster 1200 Custom. they only have a 4.5 gallon tank and I would like to put a set of Fat Bobs on it. is it possible to do this being the fuel pump is in the tank? I normally will ride between 250 and 500 miles at a time when I get out. I dont want to fill up every 100 miles.

Can I change the gas tank on a fuel injected Harley Sportster?