Is it just off on the high end, or is it off on the low end also. I've always been more concerned with how accurate it is when I'm getting close to being empty. Couldn't care less what it reads when full.
Maybe you just need to give the float arm a little bend to get it to the right level. For instance, if it never reaches full, and reads empty before it is, bend the fuel arm down. This will cause the sweeper to read higher at the same amount of fuel.
