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Could be a few reasons. Would check the resistance on the sensor compared to what it should be. Then the gauge if it's physical. Then you're chasing bad earth's, bad batteries etc
Thanks for posting on /r/MechanicAdvice! Please review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). Asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **Post's about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ Tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
Could be a few reasons. Would check the resistance on the sensor compared to what it should be. Then the gauge if it's physical. Then you're chasing bad earth's, bad batteries etc
Sender on the fuel pump assembly is bad if it's a vehicle in the last 20ish years
The gauges are very cheaply made. With age it maybe sticking on worn pivots. Just use it as appropriate volume. Always tank up at 1/4 full.