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SORN
by OldSkrote - 31/07/25 02:07 PM
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New
by Rex_tulips - 30/07/25 07:59 PM
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Forums34
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Aug 24th, 2023
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Joined: May 2012
Posts: 1,639 Likes: 20
Talk Morgan Enthusiast
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OP
Talk Morgan Enthusiast
Joined: May 2012
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This has been on my “to do” list for a long time now. My fuel gauge has always been biased in one direction. When the tank is filled the needle remains hard pushed up against the end stop (almost out of sight) until I’ve used about 3 gallons, then it starts to fall normally. So I thought I would post my attempt at a bit of re calibration. Step.1 Find a suitable potentiometer to put in series with the gauge. Fill the tank, start engine and adjust pot until the needle just comes up to the full point.  Step.2 Measure the pot.  Step.3 Source a fixed resistor of a similar value (15 Ohm) and attach to gauge.  The needle now looks better positioned when full. Only time will tell if it performs over the entire the range.
Roger
2011 Plus 4
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Joined: Jul 2011
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Talk Morgan Addict
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Talk Morgan Addict
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Nice one Roger, I hope it works.
Ian
2011 Plus 4
Wild Mogs Reims 2019, Goodwood 2018, Isle of Man 2017, Carried on to Caramulo" 2016
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Joined: Apr 2014
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Talk Morgan Sage
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Talk Morgan Sage
Joined: Apr 2014
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Nice bit of crimping work.
Best Regards
Lang may yer lum reek
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Joined: Jul 2007
Posts: 26,766 Likes: 427
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 26,766 Likes: 427 |
I have been runnig the roadster with the sidelights on as some folk don't see the car as it is dark blue.
But the gauges then mist up. Rog are those holes in what looks like the botom of your gauges drain holes?
JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
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Joined: May 2012
Posts: 1,639 Likes: 20
Talk Morgan Enthusiast
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John, the holes are at the top of the gauges and are original. I assume they are breather/vent holes.
Roger
2011 Plus 4
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Joined: Jul 2007
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Member of the Inner Circle
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Member of the Inner Circle
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Cheers will have to take a look somehow
JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
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Joined: Apr 2014
Posts: 3,547 Likes: 4
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Talk Morgan Addict
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If its a smiths gauge and sender it's supposed have a 10 volt regulator according to some sites.
I have yet to see if mine has said regulator.
Mark - No Longer driving Archie the Old English Sheep Mog........... 2010 Roadster 3.0 V6 (S3) 
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Joined: May 2012
Posts: 1,639 Likes: 20
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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A little late but I have just been asked for some results regarding this old post.
After adding the resister I did three tests. I measured the amount of fuel needed to fill the car from the ¾, ½ and ¼ gauge positions. Not very scientific but I tried to be as precise as possible. I used the same pump and filled to the first click. I remember just driving around to use up fuel until the right moment to top up again.
¾ full = 17.5 litres (to top up)
½ full = 27 litres
¼ full = 38 litres
My tank holds 55 litres, I have not done any testing below ¼ full and I only ever did the three tests.
Roger
2011 Plus 4
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