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Needle sometimes shows that tank is full, half-full, or nearly empty, all while driving a few blocks. It usually shows about 1/4 tank, but only takes 7 - 8 gallons to fill the tank.
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Either the fuel tank sender in the tank is bad and needs replacement, or the fuel gauge is faulty. I would bet the one in the tank is probably bad, because that's usually the case. Find the connection at the fuel tank, disconnect it and use a VOM to get a resistance reading while the tank is empty and reading 1/2. It should match the specs.
If your fuel gauge is showing you in accurate readings this is normal to all vehicles that are not used to fill-up gas full regularly but sometimes the cause of the inacuracy is due to faulty float valve in the gas tank you need to replace it
i would check wires leading to tank sounds like you have a bad connection or possiably a bad ground wire if connection s look good and your getting good ground more than likely you have a bad sending unit in the tank
a few things to check , if it is has a carby then maybe needle is worn and you need to crank vehicle to get fuel all the way from tank to carby , also if it is a carby there is a glass window on side of carby it should be half full at least before you try to start car , you will have to remove air filter assembly to see this on most cars ., the fuel pump is bolted to side of head or block and has a manual pump , this has a small hole at its bottom if any fuel is leaking from here then you will need to replace fuel pump.and also do an oil change as some feed fuel into your oil ..
if you car is fuel injected , maybe you have fuel blockage or fuel pump is needing replacing , change fuel filters first and make sure there is not 2 filters as some have 2 , second usually located near tank under rear of car , sometimes hidden in rear bumper.
hope this helps ..
fuel tank vent could be blocked by mud/pebbles etc, not letting the gas fumes escape while your adding fuel making it overflow, check underneath the car near the fuel tank .. something to start with..
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