[Healeys] Gas Gauge

[Michael]

No Bob it is an electrical solution.
All the little wire does is provide a solid electrical path between the float arm and the body which is part of the circuit to the gauge.
It turns out that the "jiggling" of the needle is caused by the circuit making and breaking at the arm pivot probably because of a build up of fuel "varnish" on the bearing surfaces.
I intend to do a blog post with a video...
When I can find the time.

Michael S
BN1 #174

-----Original Message-----
From: "Bob Haskell" <rchaskell at earthlink.net>
Sent: ‎26/‎08/‎2015 6:16 p.m.
To: "Michael Salter" <michaelsalter at gmail.com>; "healeys at autox.team.net" <healeys at autox.team.net>
Subject: Re: [Healeys] Gas Gauge

Michael,

Do you think the link you added helps from an electrical point of view, 
or from motion/vibration point of view?  I'm thinking the latter - less 
bounce, less movement across the wire wound resistor - less motion of 
the gauge needle.

Cheers,

Bob Haskell
AHCA 3000 Mk I registrar
http://www.ciahc.org/registry_3000mk1.php

On 08/26/2015 07:27 AM, Michael Salter wrote:
> Actually a Healey fuel gauge can be made to work very accurately. The
> gauge in my 100 is as steady as a rock and a very accurate indicator of
> the tank contents.
> The only change I made was to add a tiny connecting link between the
> float arm and the body of the gauge sender as in the attached pic.
> Prior to doing this I had no idea that a gauge of this type could work
> so well.
>
> Michael S
> BN1 #174
>
> On Wed, Aug 26, 2015 at 1:18 AM, John Spaur <jmsdarch at sbcglobal.net
> <mailto:jmsdarch at sbcglobal.net>> wrote:
>
>     Yes! Will you ever be able to adjust it so it works even remotely
>     close to
>     accurate? I don't think so. There are many posts covering issues
>     with the
>     fuel gauge and tank unit. My gauge and sender were "calibrated" by a
>     couple
>     of shops. The sender is a restored original. Afterwards, it would still
>     stick on full, then when over half a tank was used it would drop to 1/2,
>     then 1/4 and stop.
>
>     I finally calibrated my gauge, with a little more success than the
>     professionals, using the calibration unit in this link:
>     http://mgaguru.com/mgtech/electric/fg_01.htm BTW, I pulled the
>     sender out of
>     the car and calibrated it on the bench. You will need to approximate the
>     high and low limits which are determined by the depth of the petrol
>     tank.
>
>     Be warned, it still is almost fruitless. I believe the problem is
>     caused by
>     how the fuel gauge T and B coils line up with the armature. The fuel
>     gauge
>     needle is connected to the armature and swings based on the magnetic
>     current
>     supplied by the sending unit. Over the years the coils have tilted and
>     cannot be properly aligned with the armature when the nut is
>     tightened. This
>     throws off the adjustment.
>
>     Let me know how it goes.
>
>     Regards,
>
>     John Spaur
>     '62 BT7
>
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