It used to be that when my fuel lamp lit up on my 06 Dyna, I could see that the gauge on the cap was into the reserve section. I would fuel up. I usually got about 4 gallons in it to top up. The past couple times I have noticed the lamp on and the gauge in the reserve section, but I can only get a shade more than 3 gallons in to top up. Something is happening to my sender. Is it just wearing out? Can I remove it and adjust it a bit? Would I need to replace it to be more accurate? Meanwhile, I know from setting my trip meter that at 125 miles I need to think about gas. Since that works well, I don't know if I should even bother, but if something has a function, I like it to work properly.