It just stopped (no clicking - nothing).
The trouble is that it is solid state, so I can't do much with it. I tried whacking it but to no avail...
Anyone else had bad experiences with these pumps?

I bought it brand new about 5 years ago, but it has only done about 6000 miles, it was mounted vertically on a Mini before and is now mounted horizontally on the Moggy.
The part number for the pump is SS502 or for the kit: 40106K
Any ideas?