Lotus Elan and Lotus Elan Plus 2 Forums

I would like to know what the expected ohms resistance range should be for a 1963 Series 1 Elan Smith's fuel sender. Ohms reading at full vs. empty. The Smiths sender which is currently installed is model number: FT 3334 / 50. The fuel gauge is Smiths FG 2530 / 71. Thank you.

Please check here
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I found the same sender installed in my S4 tank and the range was from 3 ohms empty to 83 ohms full.

If the S1 and S4 have the same sender one of them is likely wrong. Info about this is on this forum somewhere. I saw it recently.

Late to the party! The FT sender is the correct one for a S1/S2 Elan and nominally is 0 Ohms in empty position and 87 Ohms at full.

I measured my original one, 30 years ago when I fitted a new tank with the later, wrong, sender, and it was less than 5 Ohms empty and between 75 and 80 Ohms at full. My gauge is type FG.

A thread started by nomad "Fuel Gauges ??" 14/01/2015 includes a description by rviani, according to my notes.

Thank you everyone for your inputs. Very helpful. I tested my FT sender; it registered ~3 Ohms empty and ~87 Ohms full. And accurately, the gauge followed the spectrum of the sender. Now to reinstall the sender so it doesn't become the source of a fuel leak...

“ Now to reinstall the sender so it doesn't become the source of a fuel leak...”

as well advised by others…use Hylomar

Thanks for the tip. I opted for Permatex H3 Aviation Sealant. So far there seems to be no leaks!