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fuel senders

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bradfnp(at)msn.com
Guest

Posted: Wed Jan 25, 2006 12:57 pm Post subject: fuel senders

hello all,

after a short hiatus, I have returned to working on N969BC, my 601XL.  I have a question regarding the fuel senders.

I have installed both units on the top of the tanks as so many of you suggested. I bent the float arm so the float rests on the very bottom of the tank when it is empty.  According to the plans the Ohms should be 70 for empty and 10 for full fuel.



Of course that's not exactly how mine turned out.  both tanks varied somewhat from 70.5 to 68.3 (empty)  as I added water 2 gallons at a time I took a new reading with the Ohm meter and started getting inconsistent results.

0 gals; 70.5/68.3 (in Ohms, Right tank then Left)

2 gal; 46.4/37.2

4 gal; 35/27.8

6 gal; 28.5/21.9

8 gal; 22.2/21.9

10gal; 24/22.2

12 gal;27/29.6

14.5 gal; 26/27

Believe it or not, at 6 degrees incidence 14.5 gal was the most I could stuff into the tanks.  you can see the inversion of the readings (at) ~ half tanks I assume due to the bent float arm

is this discrepancy something that I can rectify when the gauges are installed? did I make a huge error when I installed the damn things?  any suggestions?



-Brad Cohen

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nfivesl(at)yahoo.com
Guest

Posted: Wed Jan 25, 2006 1:49 pm Post subject: fuel senders

Hi Brad:



I'm probably missing something here, but why don't you

wire the fuel gauge to the sender, then add 12Vdc to

get an actual reading on your gauge?  



That's what I did.  



Scott Laughlin

www.cooknwithgas.com



 	  Quote: 	
		   

 <bradfnp(at)msn.com>


	


 	  Quote: 	
		   Believe it or not, at 6 degrees incidence 14.5 gal

 was the most I could stuff into the tanks.  you can

 see the inversion of the readings (at) ~ half tanks I

 assume due to the bent float arm

 is this discrepancy something that I can rectify

 when the gauges are installed? did I make a huge

 error when I installed the damn things?  any

 suggestions?

 

 -Brad Cohen

- The Matronics Zenith-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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p.mulwitz(at)worldnet.att
Guest

Posted: Wed Jan 25, 2006 7:03 pm Post subject: fuel senders

Hi Brad,



I think your problem might be the water.  The fuel sender has an open 

frame variable resistor which the water can reach.  If the water is 

not completely pure, it will short it all out.  I don't think this 

will cause permanent damage.  Just dry it all out and repeat your 

test using fuel.



Good luck,



Paul

XL wings

At 12:56 PM 1/25/2006, you wrote:

 	  Quote: 	
		  

   as I added water 2 gallons at a time I took a new reading with 

 the Ohm meter and started getting inconsistent results.


	


 	  Quote:

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jon(at)joncroke.com
Guest

Posted: Wed Jan 25, 2006 9:50 pm Post subject: fuel senders

Hi Brad,



I went thru this same thing a couple years ago... here is the reason for 

inaccurate readings..



If you use WATER, there are minerals (salt, iron etc) and you have created a 

small battery!  You have an aluminum tank, and an electrolyte (water with 

trace minerals, esp if you have well water) and then some steel parts in the 

sender.  If you use your VOLT meter, you can detect millivolts being 

generated from this combination that will mess up any OHM meter readings.... 

the moral of the story is: dont use WATER to take your tests.  USE gasoline 

or other solvent and you will find it works just right.  The complete story 

is in the archives (with my name)... like I say, I went thru this SAME issue 

and it was frustrating and misleading until I discovered this!



Good luck



Jon

701



---

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frank.hinde(at)hp.com
Guest

Posted: Thu Jan 26, 2006 6:35 am Post subject: fuel senders

Wasn't misleading for me...My sender quit working after I developed a

leak and tested it with water..Was hoping it would come back to life...3

years later it still don't work..



Frank



Do not archive



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