I am not quite sure what you are describing to me.
Normally there are two types of fuel senders: one with one terminal that gets the circuit return through the body of the vehicle and one with two terminals that has a wire both for the gauge and the ground return.
If your sender is a two wire type and the two terminals are shorted, you will get a F indication.
What I would do is use an ohm meter to read the resistance between the two terminals OR the one terminal and ground and move the pointer. If the resistance changes smoothly with no sudden changes the sender is probably good. If it swings back and forth suddenly, I would try and clean the sensor reostat.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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