I have seen mine (94 VX) go from 1/3 tank to almost 0 on a Interstate exit ramp where I was going 45 MPH around the cloverleaf.
That's a VX, 94 model year, not some other model that might not act the same way.
Mine would generally stay on the full mark until 100 miles if it was filled completely. When it had stabilized at 1/2 reading, it took 5 gallons to fill.
Don't waste your money trying to fix it, because it will be a waste of money. Many manufacturers have developed methods to dampen the fluctuations in fuel gauge reading, including sending units that are encapsulated with small holes to allow fuel in and out of the sending unit itself. Mercedes used this design 30 years ago.
The old simple heated bimetallic gauges with the resistance wound sending unit as a variable resistance to ground single wire setups will all do that unless you add significant baffles in the fuel tank. Same gauges were used on the original F15 fighters, because they are just about as bulletproof as you can get. Even if the in tank sending unit is shorted directly to ground you just get a full tank reading, with no sparks in the fuel tank, because the voltage to the sending unit is less than 2 volts.
My 1937 ford did the same thing. Shorter more flat tanks make it worse unless extensively baffled.
regards
Mech
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