Of course all the AC pump problems can be bypassed with an electric pump.......Over the years the AC pumps have had their fair share .....a common one was the valves dropping out of the die cast pot metal body,loose valves will leak and never prime properly .......for those who recall the XC/XD/XF Falcon cars ,the AC pumps would after a couple of years shrink the diaphragm material ,meaning the body screws would have no tension,and a bump or force on the petrol pipes would break the seal between the parts ,result being a flood of petrol all over the running engine.....Charming.