I hope its the pump and not the pipes,as they are a PITA to change,i have done the waterpump before,about 2 years ago,but it was a cheapo.TBH the water seems to be running down from above it,but i have not had a proper look as yet,in the morning i will get it on the stands and have a look.
When i refill the rad,water pisses out right away and fast,engine running or not.