Fuel gauge 1991 camry fuel gauge is stuck on full. what might this indicate.

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The fuel gauge sender in the tank is failing.

https://www.google.com/search?q=2002+toyota+camry+fuel+gauge+sender+unit

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The sending unit is on the fuel pump and could be stuck in the full position. There is no separate fuse for the gas gauge. I think you will need to check the wiring from the fuel pump where you can for breaks, cracks in the insulation and also, check the ground. If that looks ok, pull the fuel pump.

your float inside your gas tank is stuck. Or broken.

When testing a fuel guage you should disconnect the wires to it,guage should read over full,ground the float wire,turn off key then turn back on should read empty.You have to cycle the key for guage to move.If still inop the wire is broken in the harness between the tank and the dash.Voltage on the float wire is low.When tested with a test light it will barely light the light and pulsate.This test indicates the wiring is good.

Check fuel tank unit & wire by taking off & grounding wire at tank unit

replace the fuel sender, in fuel tank

OK, your fuel indicator is wired to a sending unit that is located inside the fuel tank. this assembly is part of the fuel pump assembly. the fuel indicator sending unit is housed in the same assembly as the fuel pump. The fuel indicator will not function properly if there is a bad ground or, if there is a fault within the sending unit. there is a floater device attached on this assembly and, it raises with the fuel level and lowers when the fuel level is low, sending resistance signals to the indicator gauge on your dash board. these signals can be disrupted if the ground is corroded or, if the sending unit is damaged. In most cases, replacing the sending unit will fix this issue. if the fuel indicator is stuck on the full mark, check the ground. if the fuel gauge is laying on empty all the time, replace the sending unit.

This is going to sound a little back woods but try hitting your gas tank with a hammer or kicking it because your float that sends the amount to your gauge is stuck.

your ground wire from your fuel tank to the chassis has come disconnected

replace the sending unit it will leave you stuck when not ready for it please carry small can of gas until replaced sending unit good luck