Thank you once again Vince. That explains everything nicely.
It explains why I got so much fuel out before the light came on and also why the new one didn't put the light on, as I expected it to be instantaneous.
So to conclude my experiments I not only need to do the ready can trip, but also just pop that new sender on to the loom again and give it some more time. I don't want to be selling a dud!.. and perhaps before I sell it, I ought to test the one on the SS too.
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