Originally Posted by Lordofthewings
it's helpful to see a pic of the actual unit rather than a diagram.


They are incredibly simple units, and what I found surprising is that the cover doesn't have any kind of seal, it's just held by three tags which bend over. So they must work when immersed in petrol. I haven't yet figured out why the windings are arranged to give a non-linear resistance curve, it would seem that this mght be a cause of the frequently-reported feature that the tanks. shows full for longer before plunging quickly to empty. I'm now wondering whether this was designed because the float moves in an arc?

When I get the new sender I'll set up a test rig to see if I can get a proper linear relationship between needle position and float position.

Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE