I'd make sure the strainer, usually located between the water tank and the pump is clear of any crud. I really think you need a new pump, the controller doesn't usually behave as you describe. If you pull the pump and test on the workbench, I think you'll find it still doesn't work properly.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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