I wouldn't go through the trouble of pulling the tank just yet, unless you like doing work that may not need to be done.

--> As GSXR said, check for fuel first then check the codes <--

Depending on how much gas is in the tank you MAY have to drain 80% of it, add 5 gallons of some known brand like Shell Premium, Chevron or the like, dump in some cleaner WITH TECHRON and run the engine. The change the fuel filter, put more gas and see how she goes. Only THEN consider dropping the tank. Again, why go through the troubling work if you don't have to? You can always do it later IF it needs it.
Do the simple, cheap things first, otherwise you're just throwing time and money in the wind and guessing what it may need.

Kind Regards,

Ron