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PostPosted: Thu Jan 31, 2019 1:45 pm 
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848cc
848cc

Joined: Mon Oct 10, 2016 7:06 pm
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gtogreen thanks for the link. From the photos I think that the left hand slot (from the back) is the sensitivity and the right hand slot is the zero adjust (but not sure). It looks easy from outside the car and taken apart but over the engine, in through the firewall and down below the speedo might be a little harder.
With the 7810 regulator the voltage at the green/black wire socket on the fuel tank sender (with the voltmeter black wire to the car body) was near enough to 4 volts when full and 8 volts when nearly empty. With a good mechanical stabiliser the output is 12-14 volts for about 0.7 seconds and 0 volts for about 0.3 seconds giving a rough average of 10 volts. I think that you should see about 5-6 volts flashing intermitantly on a digital multimeter when the tank is full. Dave D


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PostPosted: Thu Jan 31, 2019 7:49 pm 
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998cc
998cc

Joined: Mon Mar 10, 2014 11:38 am
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Location: Tassie
Dave Dobeson wrote:
The fuel gauge reads low: it shows half full when the tanks are full and empty when they are half full. I was hoping that the problem was the "stabiliser" output, but a very accurate 10 volts made no difference. Dave D

Have you checked that the float in the actually floats? It could have fuel in it.

_________________
1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt


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PostPosted: Thu Jan 31, 2019 8:23 pm 
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1275cc
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Location: Bundy
Scoop wrote:
Dave Dobeson wrote:
The fuel gauge reads low: it shows half full when the tanks are full and empty when they are half full. I was hoping that the problem was the "stabiliser" output, but a very accurate 10 volts made no difference. Dave D

Have you checked that the float in the actually floats? It could have fuel in it.
You can also chuck an ohm meter on the fuel sender. It should read around 250 - 260 ohms empty and 15 - 20 ohms full. A coat hanger down the filler neck will do the trick.

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1968 Mk1 Morris Cooper S


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PostPosted: Fri Feb 01, 2019 8:48 pm 
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848cc
848cc

Joined: Mon Oct 10, 2016 7:06 pm
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Yep. It floats properly and the resistances are spot on. 240 ohms empty and 30 ohms full. The resistance wire in the fuel gauge measured at 60 ohms. When the tank is full, more current flows and the gauge wire heats up and bends the bimetal spring and needle more. When empty less current flows and so the needle moves less.
Thanks Dave D.


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