Fluttering Fuel Gauge

[Mark E.]

With less than a full tank, the fuel gauge on my '70 flutters wildly on an almost continuous basis. With a full tank, it registers a steady 'F'.

Although it flutters wildly, the RMS of the needle's reading roughly matches actual fuel level.

What are the most likely causes of this? I'm hoping it might be a bad ground somewhere.

[Joe R.]

Re: Fluttering Fuel Gauge

More than likely you need to replace the sending unit in the tank. The wound resistor or wiper is corroded and needs cleaning. Easier to replace with a new one since it has to come out anyway.

JR