I ve got similar on one of my boats, and it stopped working, turns out all settings were fine,,, in the sender 'bit' you put inline, a bit of jerry can crap had been sucked up and was jamming the small turbine, so would not work...
took it out to have a look, used a bit of fuse wire to get it out, then a quick compressed air blast... stopped it happening in the future by putting a cheapy inline filter in before it gets to the turbine sender -- sorted....
Pete
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