PAS problem

My Felicia 1.9 diesel power assisted steering doesn't seem to work. I've had a look at it and found no fluid in the reservoir. So I topped it back up and started the engine with the cap off, it then started to spill out over the top.

I filled it back up and put the cap back on and started the engine again. This time it spurted out through the safety hole.

My guess is that it's not meant to do this.

Of course it's Saturday afternoon and every mechanic has gone home.

Does anyone seem to know what might be wrong with it? Could it be the actual pump at all?

Cheers