how can i replace ford ka screen wash pump?

yes I have done it now.
remove the windscreen wipers using 13mm spanner or socket underneath their covers (be carefull not to scratch the paint)
Take all 4 small screw covers from black cover at base of windscreen and use x head screwdriver and remove lift engine cover (bonnet) and remove 2 more screws at base of plastic cover prise away pump from base of tank put finger over outlet to keep screen wash attach new pump to wirers and insert into the base of tank replace black plastic cover and wipers making sure wipers do not clash with screen rubbers

Graham Hutson
November 2006