One of the engine guru's can answer your question better than I cn, but I *think* the t-stats have to open first before the pisser spits water. I have a Evinrude 200 of about the same year and that's how it works on mine. But by all means verify with either Ferm or Spare or anyone that actually knows before you ride off into the sunset.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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