[bigmac73]

I would replace the lines , or at least run a temporary rubber one from the pump then to the carb just to get it running for now so you can start making a list of things to replace
maybe pop the pump off and replace( usually cheap) you do not want the old one to leak in the crank case,

but you can take out the tank and clean out with some paint thinner or some kind of solvent and some gravel shake the piss out of it , let the gravel work any lose flaky rust and dump it out then maybe douche a little gas in it before you put it back in,
rock auto has new tanks for around 125 bones give or take 20 or 30 bucks as well