IMO the basic test for a pump which is otherwise working OK, would now be to measure the current draw. I wish I'd done this on my 30-year old MB, it would have saved me from being stranded side of road while I figured out why it'd suddenly stopped. Not sure what this one is supposed to be but on a urQ it's supposed to be about 8A, I think, and mine was drawing 13.5A+, which eventually blew the fuse.
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