I have a 2004 Toyota Tundra v8 auto, my fuel sender has a corroded spot, when I drive 50 miles after fill up, the sender hits that bad spot and my gauge needle immediately hits the bottom and then bounces back up and down many times until enough gas is used to have the sender arm beyond the bad spot. My needle used to move very slowly and it wasn't a problem as I knew once the bad spot was bypassed the gauge would show correctly again. letting various cleaners in the tank hasn't cleared the bad spot. Why has my needle started jumping very quickly instead of very slowly like in my other cars? I don't want to drop the tank to replace the sender if I could restore the slow needle movement.
No, you can't fix it. You'd have to replace the sending unit. They're variable real estates inside there and they just wear out. You can't do anything about it except replace them
