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Fuel gauge problem
https://www.ausmini.com/forums/viewtopic.php?f=2&t=18218		 Page 1 of 2
Author:  Rikki [ Sun Apr 16, 2006 6:11 pm ]
Post subject:  Fuel gauge problem
hey,

I just onnected my new VDO fuel gauge and as soon as it i turn the key and it gets power (its on acc) it goes up like its suposed to but goes up to way over full when there should be less then 1/4 of a tank, im using the standard sender and a VDO hertige gold gauge. PLEASE HELP.

Cheers

Rikki

P.S. the ohm reading at the moment it .20, if that helps
Author:  brett [ Sun Apr 16, 2006 7:12 pm ]
Post subject: 
I think you have just answered your own question. You need the correct sender unit.

the senders are callibrated to the guage
Author:  Rikki [ Sun Apr 16, 2006 7:26 pm ]
Post subject: 
ok but the sender unit i got with the gauge is a top mount style so i dont think it will fit in the mini full tank as the mini is done through the side, is there something i can (apart from a new sender) get to adjust it and use the current sender.
Cheers
Rikki
Author:  brett [ Mon Apr 17, 2006 4:05 pm ]
Post subject: 
have a chat with your supplier they may be able to help you
Author:  Mick [ Mon Apr 17, 2006 5:57 pm ]
Post subject: 
It's only a possibility but.....

you might be able to add a variable resistor in EDIT: in SERIES with the wire coming back from the guage. That combined with the resistance of the sender miiiight be able to adjust the calibration. It's tricky though and might need some maths to be done first.

What's the Ohm range of the proper sender from empty to full?
Author:  Rikki [ Tue Apr 18, 2006 7:47 pm ]
Post subject: 
Quote:
What's the Ohm range of the proper sender from empty to full?


Hey Mick,

The Ohm rating is Empty - 10 Ohms and Full - 180 Ohms.

Cheers Rikki
Author:  Mick [ Tue Apr 18, 2006 9:22 pm ]
Post subject: 
Sorry Rikki - is this the sender that came with the new gauge or the one in the tank now?
Author:  Smarty [ Tue Apr 18, 2006 9:38 pm ]
Post subject: 
Just put the tank on its side and mount in the new sender :wink:
Author:  Mick [ Tue Apr 18, 2006 10:00 pm ]
Post subject: 
Smarty wrote:
Just put the tank on its side and mount in the new sender :wink:


If you were that handy, that's what I would do...

if that's the sender that came with the gauge, I think it's and upside down one. A mini one goes from 245 Ohms empty to 19 Ohms full. Yours apears to work in the opposite direction

It might take a little extra lateral thinking to get it to work, not impossible, just a little bit of thought.
Author:  Hanra [ Tue Apr 18, 2006 10:01 pm ]
Post subject: 
Id either find out wat ohm value sender should be used with that gauge or just get a pot, take a punt on its value maybe 0-500ohm? Maybe even use a ten turn pot so its a little more accurate, fit it in series. fill the talmk and adjust the pot till the gauge reads full.
Author:  Mini Mad [ Tue Apr 18, 2006 10:09 pm ]
Post subject: 
Rikki wrote:
Quote:
What's the Ohm range of the proper sender from empty to full?


Hey Mick,

The Ohm rating is Empty - 10 Ohms and Full - 180 Ohms.

Cheers Rikki


The Mini sender is

Empty 240 ohm 1/2 65.5 ohm Full 19 ohm
Author:  Rikki [ Wed Apr 19, 2006 5:53 pm ]
Post subject: 
Hey thanks guys for your help, at the moment the Ohm reading is 20, the Ohm ratings i told you are off the new gauge, at the moment the gauge says full when there would be less the 1/4
Cheers
Rikki
Author:  Mick [ Wed Apr 19, 2006 6:04 pm ]
Post subject: 
Yeah I think your new guage reads upside down to the old one. It would be as simple as adding 60 or 70 ohms in the line to the gauge, but it still reads upside down.

You can:

A. Get the proper sender made up using the new one
B. Or see if maybe you can turn the existing sender upside down by rotating it through 180 degrees and the 70 ohm resister.
C. modify the existing float arm to face the other way and add the 70 ohm resister (Blah!).
Author:  Rikki [ Wed Apr 19, 2006 6:22 pm ]
Post subject: 
Thanks Mick, ill ask the techs at work for a resistor that should work, so once i get it i just put it inline, does it matter what end (closer to gauge or sender)????
Cheers
Rikki
Author:  Mick [ Wed Apr 19, 2006 10:13 pm ]
Post subject: 
Behind the dash is better. Get a variable resistor that has a range of about zero to one hundred Ohms and trim it till it reads correctly. Once it is adjusted, maybe put a touch of silicone on the adjuster to stop it drifting with the vibration, also make sure it is well insulated from the elements.

Don't forget that the sender is reading upside down unless maybe you have made a mistake when measuring your resistance, I'm guessing that you have :)
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