Man you have a direct short. You might as well start at the tanks and inspect the sending wire. There is a naked spot somewhere, and I'll bet on the chassis. As soon as you can find it either wrap it with tape or cut it and put in a coupler, then try a new proper size fuse. A fuse is a safty device, it lets you know that there is a problem. Adding a larger fuse is a hazzard and can cause more problems.
Your problem shouldn't be hard to find.
In the cool still quiet hours of night, you can hear chevies rusting away.
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.