96 Merc 200EFI on 18' flats boat, 6" jackplate 23p Temptest eats waterpumps every 3-4 months. It never runs hot I just notice that it won't **** @ idle. Pull the pump and its falling apart in chunks. I don't run the boat on muffs, I try not to run in water less than 3'. I do jack the motor up...