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when the tank is full the resistance is low so the power through the gage make is read full
as the tank empties , the resistance increases so the less current means the gauge reads less until empty there is little or no power , the gauge reads empty
simple check , turn the ignition off, no power , no gauge reading
There is a fuel gauge sensor in your fuel tank. If the sensor is out of place, it will not read the amount of gas in your tank correctly if it is out of place. This is a fixable job, but I recommend a ceritfied mechanic. Hope this helps! Please give 4 thumbs up!
You weren't low on gas - your fuel tank sending unit is failing and needs replacement. It's inside the tank and usually can be replaced without replacing the fuel pump as well - don't get suckered into that.
Youre gauge is controlled by a plunger in the fuel tank which is attached to the sensor and the fuel gauge. it sounds like when the plunger goes down half way its either getting stuck down lower then it should. Needs replacing. Any mechanic can do this install for you.
You have to drop the tank, on your fuel sending unit if the "float" that tells the gauge how full your tank it. These like to get holes, or jam up. So it is only going up half way, and your gauge only reads half full. So it could have a hole, it could be sticking, or a variety of things. Before you go doing all that, I'd check the ground wire off your unit, since it is working doesn't sound like a ground issue, but they can be tricky. Good luck.
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