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VDO Fuel gauge wild reading...

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SIDESLIP

Joined: 14 Oct 2012
Posts: 78
Location: CYOO

Posted: Wed Nov 28, 2012 6:56 am Post subject: VDO Fuel gauge wild reading...

Hello all...



Got another little "issue". I've got the 912 gauges in my 601XL-B. I've got a single fuel gauge with a left/right tank switch. When flipped to the right tank, the needle slowly winds its way past 1/1. Bad ground? Bad sender? It's a top mounted sending unit, but that is the extent of my knowledge on this subject. If it was a bad ground, would the needle not slam itself to its full swing past full? The fact it takes a bit has me wondering. 



Thanks in advance!



Chad

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_________________
C-GYXQ. 912ULS. 601XL-B

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Nov 28, 2012 2:20 pm Post subject: VDO Fuel gauge wild reading...

At 08:56 AM 11/28/2012, you wrote:

 	  Quote: 	
		  



Hello all...



Got another little "issue". I've got the 912 gauges in my 601XL-B. 

I've got a single fuel gauge with a left/right tank switch. When 

flipped to the right tank, the needle slowly winds its way past 1/1. 

Bad ground? Bad sender? It's a top mounted sending unit, but that is 

the extent of my knowledge on this subject. If it was a bad ground, 

would the needle not slam itself to its full swing past full? The 

fact it takes a bit has me wondering.


	


   Get out your ohmmeter and find the DIFFERENCE

   between the two senders. The slow motion of the

   gauge is not uncommon. At Cessna back in the 60's

   we 'dopped' the pivots on Stewart Warner gauge

   clusters with a drop of high viscosity silicon

   oil. This didn't affect accuracy but it stopped

   needle jitter due to mechanical and/or electrical

   stimulus.



        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------

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SIDESLIP

Joined: 14 Oct 2012
Posts: 78
Location: CYOO

Posted: Wed Nov 28, 2012 3:28 pm Post subject: Re: VDO Fuel gauge wild reading...

Difference? Well, the tanks are full, so the only thing I could establish MAYBE, is the current resistance at the gauge for each of the senders. 



Is that what you mean?



Thanks Bob!



Chad

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_________________
C-GYXQ. 912ULS. 601XL-B

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Nov 28, 2012 6:21 pm Post subject: VDO Fuel gauge wild reading...

At 05:28 PM 11/28/2012, you wrote:

 	  Quote: 	
		  



Difference? Well, the tanks are full, so the only thing I could 

establish MAYBE, is the current resistance at the gauge for each of 

the senders.



Is that what you mean?


	


    Sure. You have one side that reads

    right, the other one wrong. The only

    difference is their position on the

    selector switch. So in comparing the two

    sides with each other, one of them has

    a loose connection, bad sender resistance,

    or perhaps the switch itself is bad.



    Having one side that works and one that

    doesn't really narrows down the possibilities

    and offers the opportunity for comparative

    analysis.



        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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