screen washers clio?

My screen washer on my 1999 (T) Clio have ceased working. The pipes appear clear and I have bought a new (salvage) pump but that does not work either. You can hear the pump in action but nothing happens. Water won't even come out of the feed pipes when these are removed from the nozzles. Both front and rear are a problem. I suspect that water is not reaching the pump.

There is no filter on the pump and I wonder if I need to remove the tank to clear out any debris - but it seems to be clear.

Advice please