Gas tank rusted-need info for trx200sx

As title says I’ve got a 1986 Honda FourTrax trx200sx.

I purchased knowing when it runs for a few minutes it stalls out unless you give it some throttle/gas… So adjustment didn’t work and I tore apart the thing to get to the carb (not sure it was suppose to be so hard but every screw/clamp was printed in a direction I couldn’t access!).

I get carb opened up to see a bowl of red liquid and red flakes so I think I figured out why it stalls!???!!

Now I cleaned it up although I’ll need to order a rebuild kit and probably get an extra aftermarket carb as it looks like my tank is going to be a big project..

My first problem, I got the petcock off but there is still a rubber hose/gasket (gasket is black and rubber hose used to be clear probably) that I can’t get out of the tank. Does anyone have suggestion on that? It’s going to be bad enough to get the rust out of it, but I’m worried those parts will be ruined if I use a cleaning product/sealant on tank.

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