I’d suggest checking your fuel filter and changing it “frequently” (whatever that means). I had some problems with “bad gas” (which included corrosion in the fuel tank) and the filter sure saved me from lots of engine damage. It also let me know I needed a new tank. I used to have one of the small, clear, add-on filters that you could check visually but I haven’t seen them around for a long time.
One hint: if you check the fuel filter yourself, use impermeable gloves and know what you are doing. Before I did, I spilled about a quart of fuel on our garage floor and my hands smelled like high-test for a long time. good luck!