Re: [Chrysler300] 300G Gas Tank Float

[mocarjoe <mocarjoe@xxxxxxx>]

You may have a bad ground strap causing the faulty reading.  Where the 
metal fuel line exits the tank there is a metal strap/clamp that jumps 
over the rubber line connection.  Now if you put your resistor exactly 
where the resistor was, this would not be the case.  However if you used 
a ground jumper to do the testing I would check this.  Normally all you 
need to do is twist the strap back and forth around both ends. to clean 
the corrosion enough to get a good reading.

Rich Barber wrote:

>Paul:
>
>The float on my 1955 C-300 was cork and still floating fine, although 50 
>years of gas had dissolved the black tar coating on it.  There is a 
>slide wire resistor on mine that no longer functioned, so I took it out 
>and had it rebuilt.  I was not and am not happy with the rebuild as the 
>resistor installed was different than the original.  The gas gauge 
>needle always flickers now and I can't believe that is normal.   I did 
>have the cork float replaced with a hollow brass one and that worked 
>ok.  My float was accessible through a big (factory) hole in the trunk 
>floor, so replacement was easy.  I stuffed a rag into the hole while the 
>float was in the shop.
>
>I suggest you obtain a replacement sending unit and have it on hand when 
>you drop your tank.  The failed unit should have core value.  I built a 
>variable resistor system with fixed and variable resistors from Radio 
>Shack to calibrate my gauge and found that full was 10 Ohms, Empty was 
>72 Ohms.  I find that I will have to adjust the float wire angle to 
>better reflect the fuel level in the tank.  You should probably do this 
>before you reinstalling the removed tank.  Calibrate the fuel gauge 
>first, then adjust the float wire to provide the desired resistance with 
>various gasoline levels.  Please be careful.  Don't do this in a garage 
>with a furnace, water heater or any sparking motor or switch.
>
>Some or all of this information may be totally irrelevant to your newer 
>car with the 12-volt system.
>
>See attached for new gas gauge configuration (not for server).
>
>C-300'ly,
>Rich Barber
>Brentwood, CA (Got gas for $2.99 today)
>1955 C-300
>
>
>Paul Weihl wrote:
>
>My gas gauge always reads empty, even when the tank is full.  I have checked the resistance of the tank float and it reads about 47 ohms, indicating that the tank is empty.  I then substituted a 20 ohm resistor in place of the float and the gauge reads about half. So the problem is in the float or the resistor in the float.  My question is, what is the float made of, a fiber type material that would/could get saturated, or a sealed metal "can"?  I really don't fancy the idea of having to drop the tank if there may be another way to fix the float.  Probably wishful thinking on my part.  Thanks for any help. 
>
>Paul Weihl
>300G
>
>
>
>
>
>
>
>To send a message to this group, send an email to:
>Chrysler300@xxxxxxxxxxxxxxx
>
>For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm 
>Yahoo! Groups Links
>
>
>
> 
>
>
>
>  
>


------------------------ Yahoo! Groups Sponsor --------------------~--> 
Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page
http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/8LmulB/TM
--------------------------------------------------------------------~-> 

To send a message to this group, send an email to:
Chrysler300@xxxxxxxxxxxxxxx

For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/Chrysler300/

<*> To unsubscribe from this group, send an email to:
    Chrysler300-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/