Fuel gauge trouble

Greetings:

The fuel gauge on my TR6 has just started to read
about 1/4 lower than it's supposed to throughout the
range.  A full tank reads 3/4, half a tank will
register as 1/4, etc.  

Any ideas as to what's wrong?  A grounding issue
perhaps?

Thanks,
Joe Merone
CF18928  


                
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