So my Volvo 340GL 1990 has a problem with the windshield washing fluid tank. After fully filling it with washing fluid and spraying some on the windshield 4-5 times, the tank suddenly empties itself. The fluid drains down towards the front of the car from under the tank.

Is there some switch or knob or something that I should close or turn or something, or is it just broken? While it is full it doesn't leak, and there are no visible cracks on the tank.

Seal on the pump?

Ben

Perhaps a hose connection has come loose.

Bests for now, bogs.

+1 on checking the pump to know if it went bad or not.

I had this recently, mine only emptied to the seal where the pump inserts into the tank so it was easy to find. I removed the pump, removed the small o-ring type seal. Sprayed clean with contact cleaner and applied silicon o-ring grease and reassembled, been fine ever since. give that a shot