I had the same problem and discovered that the final connector on the tube leading to the squirter nozzle contains a small ball-bearing, probably designed to allow a one-way flow of water. In my case this bearing moved and blocked the flow of water. I tried moving it back to it's original position but it merely went back to the blocking position so I removed it altogether and now I have a full flow to both squiters and have had no ill effects from the removal of the bearing.

Feidhlim
Dublin, Ireland
VX Limited Eddition #122 (of 175)