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Wassup man. I also have a 92 Caprice that does the same thing. I'm no mechanic but I heres what I think. We are rolling on a 21 gallon tank. The tank is long and skinny. When it gets half empty (mines actually does it at about 1/4, but not all the time) and you turn, all the gas momentarily moves to one side of the tank,away from the outlet which goes to the engine, which would cause the engine cutting out or what I call a "stall". Depending on how hard you turn and for what amount of time your turning, it could cause it to die, because gas is not getting to the engine.
The gas gauge problem is related to the same thing. Because of the shape of the tank and however the sensor is setup on the inside, when space gets in the tank, the gas moves and swishes around. I notice when I brake, the gauge moves one way and when I take off it moves the other, Same way with going up and down hills. Only when you are stopped or driving on level ground will you get an accurate reading. So that has to do with however the gauge or sensor is set up inside the tank to measure the gas.
The gauge rising to the top beyond the top line? I chalk that up as they drew the top line wrong.
Overall, I don't think it hurts performance or the engine. I've owned mine for almost 5 years. The stalling probably looks like your shifting a manual to other drivers. The dying out is what I have a slight-problem with because it's embarrassing, especially in mid-turn. But no biggie.
Now what you may want to do is change out your fuel filter. You can get one for no more than $10 and do it yourself. It's located on the passenger side rear somewhere around the wheelwell. After I changed mine, the stalling and dying out happens alot less.
BUT!! I say again, I'm not a mechanic, I'm just going off experience. Somebody else will either back what I'm saying or make me look like a complete idiot. But I think I'm right.
Good luck man
dirt & water
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