Join Date: Feb 2007
Nominated 16 Times in 67 Posts
TOTW/F/M Award(s): 28
Thanked 5,200 Times in 4,712 Posts
Generally fuel gauge systems have a voltage regulator to smooth out the voltage variations otherwise the readings would tend to be all over the place. I am not sure where it may be located on your car but many cars have it located around the speedo panel. A poor earth will also have the same effect so it would be prudent to check the earth at the fuel sender.
My first check would definitely be the earth.
Currently in madnoel10's garage:
Honda Civic 1.4l