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Re: fuel gauge stuck on half full
I can tell you almost for certain your fuel level sending unit is bad, I have been able to fix them though. It requires removing the gas tank and then the fuel pump. You can if your inclined, bend the brushes on the small circuit board over more so they will make better contact on to it. Other wise its a new fuel pump assembly, check all plugs and wiring by unpluging and repluging them to insure no bad connect. It is possible it could be the guage itself, but in thirty years of fixing cars never had a bad guage
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It could be a few things - stuck thermostat , bad sending unit , bad gauge in the dash.
I would HIGHLY suggest going to a parts store and buying a Haynes repair manual ( about 25 bucks ) before you do anything else. It will give you step by step instructions / diagnosis on this problem and a whole lot more ! Well worth the money.
you probably have a bad fuel level sensor in the fuel tank.you will have to remove the fuel tank to replace the sensor.the contacts on the sensor will break causing the fuel gauge to be inacurate.you can buy the sensor without having to buy the whole fuel pump assembly.
Sounds like the float on the sending unit got stuck. This is a backyard tactic but... Try hitting the bottom of the gas tank with a hammer and see if it frees it up. Don't go and beat the hell out of it. A few decent whacks and it should come free. If not you'll need to have the fuel pump/sending unit replaced.
It IS the sending unit. There's just no other explanation. If it gave you no reading or never changed then it could be other things but the other things it would be would keep you from getting any reading at all. The person who put the new one in either damaged the slide, which isn't hard to do, or didn't connect it right. Take it back to them and make them fix it OR the part could have been bad from the store. My friends at NAPA say as many as one in ten new parts aren't any good. If you used a used part then it might just be another worn out sending unit. I usually try very hard to not be so "matter of fact" but I can't come up with any scenario where your problem could be anything but the sending unit. If I end up being wrong, I'd love to know because I tried as hard as I could to blame something other than the s. unit. Am curious to see if I'm right. Best of luck!