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I had a rather large puddle of washer fluid on my garage floor the other day, so I took the inner wheel well cover off to look at the tank. It looked intact, I checked connections hoses and pumps. I poured some fluid in, did not notice as much as a drop so I filled it up a bit more. No visible leaks. I put everything back together, took the car for a drive before going to bed for the night. In the morning I was greeted by yet another puddle. I did not use the washer fluid on my drive. What gives? A really, really slow leak somewhere?
Check where the pump mounts into the reservoir. If it's anything like my BMW 325i, the pump dredge slides into a strainer cup. Make sure the pump is fully seated into the strainer cup. It's possible that the strainer needs to be replaced also, as it serves as a gasket. The pump could be bad, or you could have a hairline crack in the reservoir. Let the reservoir leak, until it stops leaking. Then that will be telling where the leak is coming from. Good luck!