[T3] Fuel gauge issues (jumpy needle)

[Craigs List]

Have you checked that is is properly grounded? A bad ground can cause a
jumpy needle. I have one myself.

Adam

On Thu, May 28, 2015 at 6:00 PM, Jacob Adam Schroeder <
jacob.schroeder at gmail.com> wrote:

> Also, I saw the fix that somebody shared previously about drilling a hole
> in the center of the sender.  That was interesting but I'd prefer not to
> make that mod if I can avoid it.
>
> On Thu, May 28, 2015 at 3:58 PM, Jacob Adam Schroeder <
> jacob.schroeder at gmail.com> wrote:
>
> > I have a 1972 Squareback and have been having a recent issue with my fuel
> > gauge.  I recall the the gauge used to work, so I am not sure what has
> > changed over time.
> >
> > The gauge appears to be accurate, when it is steady.  But the problem I
> > have is that the needle jumps around like crazy (especially when I am
> > driving).  From looking at the gauge, it appears that there are two
> ground
> > points: (1) through the housing to the spring clips to the dash, and (2)
> a
> > ground wire to the back of the gauge through the black plastic piece that
> > clips on to the rear of the gauge.
> >
> > Are these grounds redundant in that only one has to be good?  Do both
> > grounds service the fuel gauge or is the wire for the lights and the fuel
> > gauge grounds through the clips?
> >
> > The bouncing needle to me indicates a grounding problem, but I cannot
> seem
> > to track it down.
> >
> > Also, I followed the test in Bentley--disconnecting the sender and
> > grounding the wire to the sender housing, and the gauge reads full.  So,
> > according to Bentley, the sender is good.  I tested a spare sender and
> get
> > the same jumpy needle.  So I am fairly confident my sender is OK.  But,
> do
> > the late (1972) sending units need a tab of exposed metal on the tank for
> > grounding?  I saw something to that effect in Bentley and I did repaint
> my
> > tank within the past few years, but did not leave a portion of exposed
> > metal along the circumference of where the sending unit mounts to the
> tank.
> >
> > Also, could be unrelated, but I also get an intermittent fast turn signal
> > blink that may share a similar cause.
> >
> > Any help would be appreciated.  Thanks,
> >
> > Jacob
> >
> >
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