Seems to have been a sender issue. I pulled the sender out to change the gasket, and while it was out I measured the resistance at both ends of the range to see if it was working OK. It seemed to be, so I put it back and now it is working fine. Maybe it got stuck? If it fails again I may need to replace it.

On a side note, I noticed that the gasket was disintegrating. Not sure now if this is the Morgan original (at less than 2 years old), or the one that came with the replacement 280mm sender, but I got a replacement on Amazon. It is a "VDO 226 053 Fuel Sender Gasket". Old and new below.

PLANENUT - you might want to add this to the Alternative Parts List.

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2020 M3W