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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Aug 2017
Posts: 731 Likes: 58
Talk Morgan Regular
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OP
Talk Morgan Regular
Joined: Aug 2017
Posts: 731 Likes: 58 |
I have had problems with my fuel gauge not reading the correct amount in the tank. At first I thought it might have been the sender in the tank not working, due to the tank being empty for 2 and half years. But after putting a volt reader it was decided that the problem was the electrical regulator behind the dashboard. Alas having changed the regulator the fuel is reading correct but the Coolant temperature gauge is now reading very high.
The Coolant is Evans waterless. I'm scratching my head on the as the regulator controls both gauges.
Has anyone in TM world got any ideas to fix this. I have tried changing the connections at the back of the water gauge with no change.
As normal any help in the matter is greatly appreciated.
Navy Dave
1976 Morgan 4/4
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Joined: Apr 2017
Posts: 1,799 Likes: 4
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Apr 2017
Posts: 1,799 Likes: 4 |
Could it be that the the regulator change that sorted the the fuel gauge has now also"sorted the temperature gauge and in fact that is the correct reading.
Waterless coolant can make some systems run hotter if they were marginal in the first place.
What is the gauge reading and have you checked it by putting the sensor in just boiled water. Maybe the gauge is correct.
Could be you have a cooling problem rather than a gauge problem.
Bob
2009 Black Roadster
1999 4/4 2 litre Zetec
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Joined: Oct 2013
Posts: 6,723 Likes: 2
Talk Morgan Sage
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Talk Morgan Sage
Joined: Oct 2013
Posts: 6,723 Likes: 2 |
What is the gauge reading and have you checked it by putting the sensor in just boiled water.
Having trashed a new sensor by doing just that, it seems thermal shock can have a negative effect (as the chap told me when I complained..). The best way is to pop it in water at room temperature and heat gently..
Steve
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Joined: Jul 2007
Posts: 28,911 Likes: 354
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,911 Likes: 354 |
Check the earth connection to the gauge 
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW
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Joined: Feb 2016
Posts: 8,702 Likes: 416
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,702 Likes: 416 |
I have had problems with my fuel gauge not reading the correct amount in the tank. At first I thought it might have been the sender in the tank not working, due to the tank being empty for 2 and half years. But after putting a volt reader it was decided that the problem was the electrical regulator behind the dashboard. Alas having changed the regulator the fuel is reading correct but the Coolant temperature gauge is now reading very high.
The Coolant is Evans waterless. I'm scratching my head on the as the regulator controls both gauges.
Has anyone in TM world got any ideas to fix this. I have tried changing the connections at the back of the water gauge with no change.
As normal any help in the matter is greatly appreciated. You don't mention what voltage is/was provided to instruments Dave. Should be 10 volts WRT instrument ground. Sensor grounding is most important as well particularly in the case of fuel gauge circuit. Recommend solid state regulator BTW.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Jul 2021
Posts: 172
L - Learner Plates On
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L - Learner Plates On
Joined: Jul 2021
Posts: 172 |
You don't mention what voltage is/was provided to instruments Dave. Should be 10 volts WRT instrument ground. Sensor grounding is most important as well particularly in the case of fuel gauge circuit. Recommend solid state regulator BTW. Richard, Many thanks for the recommended link, I was not aware of these solid state versions, I feel another preventative modification coming on!
Jack
1985 4/4 T/C 4 seater Royal Ivory
1934 F Type
2018 Pembleton SuperSport (self built).
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Joined: Nov 2018
Posts: 6,676 Likes: 441
Talk Morgan Sage
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Talk Morgan Sage
Joined: Nov 2018
Posts: 6,676 Likes: 441 |
You don't mention what voltage is/was provided to instruments Dave. Should be 10 volts WRT instrument ground. Sensor grounding is most important as well particularly in the case of fuel gauge circuit. Recommend solid state regulator BTW. Richard, Many thanks for the recommended link, I was not aware of these solid state versions, I feel another preventative modification coming on! I've used one - made my fuel and temp gauges far more accurate.
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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Joined: Apr 2010
Posts: 463
Learner Plates Off!
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Learner Plates Off!
Joined: Apr 2010
Posts: 463 |
Just what I needed another job for my winter project list.
Thanks.
Dave
98 +8 Corsa Red
74 MGB Red
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