What to check for. The petrol AYGO 1.0 water pump is proving to be a problem for all owners at some time in the cars early life, for us our car was bought 2nd hand at 3.5 years old with 12K on the clock and even then i could see the pink stains on the water pump pulley, its not a case of will it leak but when ! The tin pulley and tin base plate was a poor design and the seal was not thick enough to seal the water in, the latest upgrade pump from Toyota has fixed the problem, it has a alumin