1594 Fuel gauge...

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Howmad
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1594 Fuel gauge...

Post by Howmad » Sun Feb 24, 2013 10:15 pm

Fuel gauge not been working for a bit so decided to have a look today.
The problem is gauge is reading max all the time, even with the wire of the sender unit.
The wires are all fine, the sender unit wire to the gauge is ok not shorting to ground, earth is fine and it get full volts to positive side of gauge.
Just wondering if the gauge is faulty or am i missing something easy...?
1594 CE/QD90 Loader

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6-POT-PHIL
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Post by 6-POT-PHIL » Sun Feb 24, 2013 11:11 pm

Have you actually had the sender unit out? Theres a wire that runs down the length of the sender unit and these are common for breaking where they are soldered on.

Phil :)
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richbug
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Post by richbug » Mon Feb 25, 2013 12:36 am

If you ground the wire that goes to the sender, does your gauge respond by going to empty?

The sender should be about 0 OHMs empty and 200 OHMs full.
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Howmad
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Post by Howmad » Mon Feb 25, 2013 9:51 am

Thanks lads for the quick reply's, gauge does not go to empty when wire is grounded, will test ohms today and remove unit to check the wire on it.
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Howmad
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Post by Howmad » Wed Feb 27, 2013 10:38 pm

Fuel sender fine, must be the gauge me thinks, anybody have one spare or know were i might be able to get one...
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885mac
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Post by 885mac » Thu Feb 28, 2013 12:26 am

Just my two cents worth i had the same problem with mine reading full all the time. I replaced my sender unit as the other one had a float which was full of fuel!! However on replacing it I still had a full reading. I traced the source to the connection on the PCB in the dashboard which when the small nut and washer was moved it cured the problem I would clean that connection first.

Howmad
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Post by Howmad » Tue Mar 19, 2013 6:24 pm

Finally got some time to try what you suggested 885mac, no joy though just the same gauge stays at full.
Just a thought when the wire to the sender unit is disconnected from the unit should there still be a reading at the gauge.
I get the live reading and i also get a reading from the sender whether it is connected or not about 9.75 volts.
Wire is ok is not grounded and continuity is fine, it just seems very strange before i spend a fortune on a new gauge...
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kato
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Post by kato » Tue Mar 19, 2013 10:26 pm

Do you measure 9,75 V at the sender ? If you do and ground that wire at the sender, the gauge should move to empty.

Take a look here: http://dbtc.co.uk/index.php?name=PNphpB ... highlight= might give you an idea or two..

Brgrds,
Kato
Brgrds,
Kato.
------------
DB Case 1190

Howmad
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Post by Howmad » Tue Mar 19, 2013 11:18 pm

Hi Kato, thanks for the reply, gauge does not go to empty when wire to sender is grounded, leads me to think there is a short in the gauge itself...
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kato
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Post by kato » Wed Mar 20, 2013 9:20 am

Ok, if you are sure that you get a good ground connection where you ground the "live" lead. - The problem is most likely in the gauge, but since you get 9,75V I think that you might have a gauge that is "stuck". It might help to flush the mechanism in the gauge with some WD40 or simular stuff.. (it helped me).

But try to check the point that you are grounding the wire first. Time and rust cause things to behave strangely. Scrape for bare metal and check for continuity to battery minus.. (Been there..)

Brgrds,
Kato.

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jules
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Post by jules » Wed Mar 20, 2013 10:51 pm

Howmad, is it true to say that the gauge never, ever goes to zero, even when you turn the ignition off? When the ignition is off the only force acting in the gauge is the coil spring that returns the needle to zero, so if this isn't doing its job it's likely that you've got a stuck gauge, as kato says.If so, you could try kato's WD40 trick. While it's not a nice lubricant for the long term it will give you an idea if you're on the right track.

If the gauge is permanently stuck, there are people who can fix them for a reasonable cost, certainly less than buying a new one.

jules

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kato
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Post by kato » Thu Mar 21, 2013 11:15 am

It depends on witch type of gauge it is. Mine is a "balanced coil" type and it stays where I left it. Since this is instrument in a 1594 and mine is a 1190. - I assume they are identical, unless they have used an older "bi-metal" type in the 1594.

Just a haeds up that there are different types of gauges out there.

Hope you figure it out. Let us known how it turns out...

Brgrds,
Kato

Howmad
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Post by Howmad » Sun Mar 24, 2013 11:33 pm

Hi kato and jues, gauge does move ok, goes to zero when ignition is of.
Going to try a temp gauge when i get a chance if that works then at least i can cure the problem all going well.
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jules
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Post by jules » Tue Mar 26, 2013 7:44 am

Could be a short in the plastic sheet pcb. They're a bit flimsy.

When you say you're going to try a temp. gauge, what do you mean?

jules

Howmad
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Post by Howmad » Tue Mar 26, 2013 12:53 pm

Sorry meant temporary fuel gauge is what i meant to type...
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