On 1992 Evinrude 125, running hot at idle. Cools nicely at high RPM. When first started, it takes a long time to pump water. Even if just turned off for a minute, seems to take too long to get water to pump through tell-tale. I know replacing the water pump is first, but is there anything keeping the prime or keeping the water in the motor? I read about a poppit valve but can't find it on the parts diagram or in Clymer.