What do you think, should I even bother trying to fix this, or just deal with the SES light?

Yes, my gas cap is on tight. And yes, it keeps coming back even after being cleared.

If I fix it, I also happened to notice that my filler-tube (the metal tube coming from the gas cap to the hose that connects to the tank) is rust as HELL. Is it an easy part to replace? Does anyone know what the part # is?

https://www.gmforum.com/showthread.p...ighlight=P0446

just had to do the filler tube on my inlaws 96 bonnie, nothing special just go to the parts store and ask for a filler tube for your car. it comes with the big tube and all. make sure you get the plastic thing under the flap going the right way, we learned that the hard way.

Did you need to put it up on a lift/jacks to do the tube? How much did it cost?

that car had a panel you could remove to get to most stuff, i guess it would be called inner fender behind driver rear tire i did have to jack up the car and put it on jack stands to remove the tire and get better angle on the clamps where it meets the rubber lines from the tank. it was about 120-130 after some stainless clamps and tax.