gas guage is just up and down
2 Answers
It is a very common problem. The fuel sending unit is goobered up and therefore is not giving you a clear reading. GM sells a fuel additive that you put into the tank that will fix the problem about 75% of the time. There are also a few generic ones you can get at, say a Wal-Mart, that will do the same thing but I am unsure which ones work the best
enginecreator answered 6 years ago
It is common for the fuel level sensor in the fuel tank read the fuel level incorrectly. The sensor must be replaced to correct the condition. I recommend having the complete fuel pump module replaced on high mileage vehicles since the unit has to be removed in-order to replace the sensor so replace the entire unit to avoid undue service & labour cost in the future..