Discussion
Hi
This is probably a really basic question...
Trying to calibrate my fuel gauge. When full I get about 7 ohms of resistance. Empty seems to be about 180 ohms or so. This is taking a reading between the sender unit and an earth connection.
BUT when I turn the ignition on the readings go crazy. The empty tank shows infinite resistance (i.e. I can't get any reading at all) and the full tank shows about 165ohms.
Is this normal, or might I have some sort of short circuit going on.
Am I taking readings between the right wires?
As it stands my fuel gauges are not accurate - they read full when full, but when they lose about 10 litres they read about 1/4 full.
I have standard VDO tube sender units, Ultima supplied.
Thanks
Mark
This is probably a really basic question...
Trying to calibrate my fuel gauge. When full I get about 7 ohms of resistance. Empty seems to be about 180 ohms or so. This is taking a reading between the sender unit and an earth connection.
BUT when I turn the ignition on the readings go crazy. The empty tank shows infinite resistance (i.e. I can't get any reading at all) and the full tank shows about 165ohms.
Is this normal, or might I have some sort of short circuit going on.
Am I taking readings between the right wires?
As it stands my fuel gauges are not accurate - they read full when full, but when they lose about 10 litres they read about 1/4 full.
I have standard VDO tube sender units, Ultima supplied.
Thanks
Mark
I believe it's due to the shape of the tanks you will get an empty reading even though there's half a tank still available. I have a SPA digital dash and took reading every 15 litres, I could only get 72-73 litres in so I guess there was a little in the bottom plus the sponge.
Tank empty 68 ohms
15 litres. 48 ohms
30 litres. 38 ohms
45 litres. 34 ohms
60 litres. 19 ohms
73 litres. 6 ohms
There is a gizmo you can fit from a company called Spiyda Design that converts the signal for odd shaped tanks.
https://www.spiyda.com/magento/index.php/vehicle-e...
HTH
Tank empty 68 ohms
15 litres. 48 ohms
30 litres. 38 ohms
45 litres. 34 ohms
60 litres. 19 ohms
73 litres. 6 ohms
There is a gizmo you can fit from a company called Spiyda Design that converts the signal for odd shaped tanks.
https://www.spiyda.com/magento/index.php/vehicle-e...
HTH
Ultimike said:
Is that link correct? I would love to get my fuel tank readings more accurate. I max at about 55 litres when my tanks show empty.
I think this is the one that reads fuel level and morehttps://www.spiyda.com/magento/index.php/vehicle-e...
845ste said:
but gtr have original tank 27 liter each, for a total of 54l.
it's wrong?
mine have 27+27
Ultima fuel tanks are 40 litres each, but mine (2007) are filled will foam so some capacity is lost. it's wrong?
mine have 27+27
Graham-P said:
Ultimike said:
Is that link correct? I would love to get my fuel tank readings more accurate. I max at about 55 litres when my tanks show empty.
I think this is the one that reads fuel level and morehttps://www.spiyda.com/magento/index.php/vehicle-e...
845ste said:
but gtr have original tank 27 liter each, for a total of 54l.
Will this only work with a digital dash or will it also work with the standard fuel gauges?
it's wrong?
mine have 27+27
Ultima fuel tanks are 40 litres each, but mine (2007) are filled will foam so some capacity is lost. Will this only work with a digital dash or will it also work with the standard fuel gauges?
it's wrong?
mine have 27+27
Ultimike said:
Is that link correct? I would love to get my fuel tank readings more accurate. I max at about 55 litres when my tanks show empty.
also I have filled them with sponge (now after 15 years I have to replace it with a new sponge): I tried to fill them and we are about 27 liters each.probably in 2001 they contained up to 27l
boh!
Thanks all
I have the gauge wizard which I have to date nstruggled to calibrate. However I think I will add another earth connection as I have 4 spade connectors on the back of the fuel gauge which might be too much....
Have just taken readings for a standard 40 litre Ultima tank which were as follows from a VDO sender unit.
Empty 73.8ohms
1/4 65.4
Half 51.7
3/4 29.0
Full 9.8
Will let you know if I can calibrate using the wizard. Ran out of time tonight.
Mark
I have the gauge wizard which I have to date nstruggled to calibrate. However I think I will add another earth connection as I have 4 spade connectors on the back of the fuel gauge which might be too much....
Have just taken readings for a standard 40 litre Ultima tank which were as follows from a VDO sender unit.
Empty 73.8ohms
1/4 65.4
Half 51.7
3/4 29.0
Full 9.8
Will let you know if I can calibrate using the wizard. Ran out of time tonight.
Mark
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