Fuel gauge issues

[Keith Davidson]

Hey Listers,
Keith again,the fuel gauge on my 1984 5ksnt has gone crazy on me.It will go 
down to empty when I am driving and then back up to halfway, then down to 
one-quarter and about where it should be.Sometimes it will stay on empty 
after I turn the key for awhile.When I fill the tank it will go to full for 
maybe 5 minutes or so,then it goes up and down.
Any suggestions?
TIA,Keith

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