To clean a tank... Well, kinda depends on what's in it.
First of all, you'll need to take the tank off and remove the gauge sending unit, fuel strainer, sediment bowl, cap, anything else attached to the tank.
If it just has loose dirt, rust, water, etc., dump it out while sloshing it around. Then add some naptha, Safety Kleen, something not dangerously flamable, and something to shake around inside the tank, like some bolts and nuts, a short piece of chain, something you can roll around in there to knock the stuck stuff loose. This will take several applications of clean solvent until you're satisfied it's clean and you're tire of shaking! Then stuff some clean rags inside and mop it clean and dry through the cap and sender holes.
If the tank is severely contaminated with varnished gas, best take it to a radiator shop and have it vatted out. Let them do the dirty work!
But! Be aware, disturbing an old tank might start it to leaking if it's rusty inside. Then the options are seal it, (which I've never successfully done, others swear by the stuff)... Or replace it.
About the fuel gauge sensor... It is simply a variable resistor controlled by a float on the end of a rod. The fuel gauge on the dash is connected through it's ground circuit to the variable resistor. The more fuel in the tank, the lower the resistance, the higher the gauge reads. As the fuel level drops, the float goes down, the resistor offers more resistance, the dash gauge shows a lower reading.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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