[Healeys] Fuel gauge damper's super capacitor

Kees Oudesluijs coudesluijs at chello.nl
Thu Nov 15 03:51:39 MST 2018

A large capacitor will slow down the build-up of the voltage, so the 
needle of the fuel gauge (which is a Voltmeter essentially) will 
fluctuate less. It works exactly the same as an air filled expansion 
vessel in a water mains to prevent knocking in the pipes due to sudden 
pressure build caused by a water shut of valve in e.g. washing machines, 
however the water is replaced by electrons

What worries me is the 5,5V which seems rather low in a 12-15V 
electrical system, but I am not an electronic man. I do not know what 
the maximum Voltage on the gauge is, but if it is more than 5,5V I 
imagine the capacitor could fail?

Kees Oudesluijs

Op 15-11-2018 om 11:07 schreef simon.lachlan at alexarevel.plus.com:
> Hi,
> Questions for the tech type super-gurus.
> See the attached article, something I picked up on the internet &/or 
> from this list.
> I’ve finally got round to doing it and have bought a pair of 
> super-capacitors (SC), below:
> https://www.ebay.co.uk/itm/2-Pcs-4-0F-5-5-V-Super-Capacitor-H-Type-Button-Smart-Capacitance-Universal/272412952404?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
> The article infers to me, at least, that the + terminal of the SC is 
> wired directly to the same terminal connection on the gauge as the 
> wire from the tank sender unit. The – terminal is earthed. How does 
> that system work? Won’t the tank’s fluctuating signal, for want of a 
> better word, simply bypass the SC and carry on flickering the needle??
> And, assuming I ever get the wiring sorted out, will the SC get hot? 
> Mine has a metal case and I’ve had to thoroughly insulate it. I have 
> visions of the fuel gauge working nicely until the insulation catches 
> fire………
> Simon
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