snippy
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| posted on 26/2/14 at 09:39 PM |
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Smiths Gauges reading incorrectly
I`m using lots of seperate Smiths Gauges in my Jago dash. I`ve got them all working but I`ve noticed that the fuel gauge is reading just over half a
tank of fuel whatever the amount of fuel there is in the tank (including when empty). The fuel tank and its sender are Ford Escort mk1. I realise that
the old Escorts used a voltage stabiliser for the fuel & temp gauges so I`ve wired one of these in (see diagram) because without it neither gauge
will work. (I`m using the original escort stabiliser)
Any ideas on how to cure problem? The only thing I can think of doing is to earth the voltage stabiliser by it`s mounting hole and see if this makes a
difference?
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snippy
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| posted on 26/2/14 at 09:44 PM |
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AdrianH
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| posted on 26/2/14 at 09:44 PM |
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I would have though the voltage regulator need to have a ground reference.
Adrian
Why do I have to make the tools to finish the job? More time then money.
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MikeRJ
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| posted on 26/2/14 at 10:04 PM |
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quote:
Originally posted by AdrianH
I would have though the voltage regulator need to have a ground reference.
Adrian
They ground through the metal case and mounting bracket. Hopefully that will fix the OPs problems.
[Edited on 26/2/14 by MikeRJ]
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teegray19
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| posted on 26/2/14 at 10:20 PM |
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if the ground doesn't sort it, look at fuel gauge wizard on ebay.
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paulf
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| posted on 26/2/14 at 11:22 PM |
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The regulator does need to be earthed but I suspect that you will still have a problem.I have a smiths gauge and a sender from an early ford possibly
cortina mk1, what I did was to make an adjustable voltage stabiliser but found that when set up to read empty when the tank is empty that it only
reads half full when the tank is full.It is one of those jobs I keep meaning to sort out but never have, ideally a smiths sender unit is needed or a
circuit to allow it to be compensated for.
Paul
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snippy
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| posted on 27/2/14 at 02:26 PM |
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I wired an earth to the voltage stabiliser and immediately both the fuel & Temp gauges dropped to just above empty. But, there they remained, as
the engine warmed up the temp gauge didn't move. The gauges mirror each other with their readings. Hmm, what to try next?
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teegray19
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| posted on 27/2/14 at 09:25 PM |
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the sender and gauge must not match, easy fix is a fuel gauge wizard from ebay to calibrate the gauge.
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scimjim
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| posted on 28/2/14 at 09:05 PM |
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connect the sender wire to a good earth and see if the gauge goes full scale, disconnect and see if they sit at zero. You can calibrate them using the
holes in the back. http://www.mgb-stuff.org.uk/fuel.htm
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snippy
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| posted on 5/3/14 at 09:17 PM |
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Some interesting reading there Scimjim. I`ll take another look but it may be that I need to look at one of those fuel gauge wizards.
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