Rusty Gas Cap/Tank

[crude]

Hi  folks,  Got a rusty gas cap. The tank is pretty much rusty inside too. From what I've been told it will screw up the fuel pump.
I'm thinking I could remove the cap and brush off the white stuff, I could get one of those nice aftermarket gas caps too. But how do you live with a rusty fuel tank?
Any suggestions? Thanks

20150815_143733 by chanhian, on Flickr

[Howie]

Surface rust is...well...not that serious.  The answer to your rust problem is http://www.por15.com/