[Healeys] Fuel Gauge dampener

Oudesluys coudesluijs at chello.nl
Sat Feb 11 01:06:59 MST 2017

The later Smiths/Jaeger gauges in many UK cars, and in the later AH for 
that matter, are bimetal operated gauges, a current regulated by the 
variable resistor in the sender heats a bimetal which will react in 
bending, driving the needle pointer, however it reacts very slowly hence 
a stable reading. These are fed by 10V provided by a small regulator 
somewhere behind the dash. They have a ca. 90º window over the scale.
The early ones are coil operated which react instantly. A capacitor to 
damped the reading is a good idea.
Kees Oudesluijs

Op 10-2-2017 om 23:29 schreef dwflagg at juno.com:
> Hey Simon,
> The Triumph Spitfires and GT6, I believe, had voltage stabilizers for 
> the fuel gauge. Maybe they could be used in a Healey? I would defer to 
> Michael for an answer.
> Cheers,
> Doug
> Hi Simon, I  think that keeping any sort of energy storage device well 
> away from the fuel gauge circuit is sage advice.
> I would suggest that you try this:
> http://www.netbug.net/blogmichael/2015/09/06/smiths-and-jaegar-fuel-gauge-solution/
> Michael S
> BN1 #174
> On Sat, Feb 11, 2017 at 7:29 AM +1300, "Simon Lachlan" 
> <simon.lachlan at homecall.co.uk <mailto:simon.lachlan at homecall.co.uk>> 
> wrote:
>     Hi,
>     I’d saved something relating to damping the fluctuations in my
>     fuel gauge. I don’t recall if it was originally posted here or if
>     I trawled it off the net. I’d made a few notes and filed it
>     appropriately against some day in the future when I might get
>     round to actually doing it.
>     So, my nephew’s fuel gauge bounces around far more than mine and
>     this prompted me to dig out the article/notes.
>     First off, I agree that there’s no sense in putting the capacitor
>     anywhere near the fuel tank.
>     Having said that, I read the advice that I’d stored so carefully
>     and began to wonder if I’d understood it correctly.
>     Is the capacitor really supposed to be wired across the two
>     terminals on the gauge? Would it have any effect? To put it
>     crudely, but in the language that I can understand, wouldn’t the
>     fluctuations still come down the Green/Black wire from the sender
>     unit and hit the gauge’s terminal T? And wouldn’t those
>     fluctuations still register as such on the gauge, totally
>     unaffected by the capacitor?
>     Shouldn’t the capacitor be wired in such a fashion that the
>     fluctuations cannot bypass it?
>     Maybe I’m over complicating things and should just try it without
>     understanding it. Maybe I think too much.
>     Simon
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