Check Valve / Wiper Nozzle /
 

See Prior Thread as a ref point

https://xoutpost.com/bmw-sav-forums/...reeze-36f.html

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While driving on the freeway, noticed washer fluid continually coming out of BOTH nozzles. When we parked, I just opened up the windshield fluid tank to let any air/vacum that might have occured...

Came back to the car, SOL, I saw fluid on the floor everywhere. Hoping it wasn't the waterpump gasket , popped open the hood and there was fluid all over the plastic cowl. I presume washer fluid continued to come out of the nozzle area and bled the reservior dry while standstill.

To further test, I filled it up about 1/6 full, just right below the indent on the tank. In 24 hrs of sitting, no fluid had leaked anywhere.
The following day, usual driving and lo and behold, the tank is empty again. It's not leaking from the pumps.

I found one thread on one poster possibly having a bad nozzle. Is it possible both could have gone bad @ the same time ?

If fluid is coming out of the nozzles and emptying your tank i would think it must be that the pump is running!

Had the same problem after replacing my washer fluid reservoir cap. It was tighter than the old cap. When the fluid heats up in the reservoir (and it does as its right above the exhaust manifold) with no vent the fluid is forced out through the washer jets, just a little at a time so you can't see. Except for the fluid dumped all over that you can't figure out where it came from. Open the cover so it can vent and see what happens. If you don't have further problems you have your problem. Drill a small hole in the reservoir cap, as I did, and you'll have no further issues. I haven't after drilling a hole in mine.

Fifty -

The 1st thing I just confirmed prior to all this was that the strainer was still there.
Regardless, let me just drill a slight vent hole.......and see if this does it. Going to be helluva a lot better than 2 heated nozzles