I have a 2000 V-P dual-prop outdrive. I bought some earmuffs from West Marine 2 years ago and they said they would work just fine. However, about ? of the time the pump cannot draw the hose water up high enough for the water to circulate. I think the problem is that these earmuffs don't fit and let in too much air. As soon as I put the boat in the water, all is fine. I put in a new water pump/impeller this year and it's the same thing. I have tried putting a bungee around them but I can see that still about ? of the slots aren't getting water. Has anyone else had this problem? Any ideas would be appreciated.