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 Saloon sender unit

 Created by: DoctorNO
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 Posted: Oct 4, 2018 02:29AM
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I'm sorry, I forgot to mention another component you may wish to invest in.

Chris at Spiyda Design in the U.K. has developed a number of electronic boards for cars.  One is his Gauge Wizard which allows you to match all types of sending units to all sorts of gauges.  In your case it would allow you to fine tune the match of the fuel sending unit to the Smiths gauge.  Take a look at the link below for more info.

https://www.spiyda.com/fuel-gauge-wizard-mk3.html

Doug L.
 Posted: Oct 3, 2018 08:00PM
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Thanks Doug! much appreciated! 

 Posted: Oct 3, 2018 05:44PM
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The resistance range (for cars built after 1965) is sort of nominal.  It is approximately 30 Ohms = Full to about 270 Ohms = Empty.  This compares well with the common Stewart-Warner range of 33 Ohms = Full to about 240 Ohms = Empty. 

For your fuel cell, buy an industry standard 33-240 Ohm range sender and use it with your Smiths gauge.  The difference at full is insignificant.  Keep an eye on the gauge for the first tank or so.  Fill up at about 1/4 tank as the aftermarket sender will reach its empty before the Smiths gauge will.  After a couple of tanks you will determine a point at which you are comfortable saying it is time to fill up.

Alternatively, most fuel cells insert the sending unit (when fitted) from the top.  You can tweak the sending unit a bit before final installation in the car so it better matches the gauge.
  

Doug L.
 Posted: Oct 3, 2018 04:40PM
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Hi guys, 
I'd like to fit a foam fuel cell to my 1980's Canadian mini saloon.
I use a classic SU electric pump.

While doing my research, I found that that sender unit's functioning resistance should be around 20 to 250 ohms.
Can I trust this value if I want to hook the Smith fuel gauge in the speedometer to the new sender unit? 

Thank you
Nicolas