Gas gauge will go from empty to full while driving down the road. It never is any where between just either empty or full. What would be the cause of it?
The float that is the sender unit in the tank is stuck this is why the gage jumps to full
SOURCE: 01 s10 gas gauge goes either full or empty
Sounds to be a faulty tank sender unit, these senders use a fine coiled wire on which a brush slides along to vary its resistance.
If the coiled wire breaks midway, the only readings will be full or empty.
I think sender unit is mounted to internal fuel pump on this model (top of fuel tank)
Hope this helps, regards
SOURCE: Why would the gas gauge on a 2005 Chevy Malibu go
This happens on mine, its got to do with the fuel sensor, I frequently fill up and sometimes keep fueling after the nozzle clicks. This is what caused my problem. I have since stopped fueling immediately after it clicks and have not had the problem. Make sure you arent over filling your tank
SOURCE: fuel sensor gauge
you will need to replace the fuel level sensor.(sending unit) it is in the tank and is hooked to the fuel pump. you can buy seperatly from pump. you may finf it easier to remove the bed if you have some help. it is six or eight bolts and harness unplugs then you can get right to it.
SOURCE: 99' blazer gas gauge eratic
I have the same problem on my 99 ZR2 Blazer. This is the rheostat in the gas tank. I bought my part in Ebay for $27. The only issue is that you have to drop the gas tank and pull the sending unit to install. Hope this helps, I hear from other message boards that it is a very common problem in these vehicles.
SOURCE: my gas gauge bounces around and will tell me its
This problem is caused by a defective fuel gauge sending unit, it is located in the gas tank.
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