Boat doesnt like to start when hot....

gahooligan · 06-16-2014, 04:35 PM

Mine will do this while running Around and starting stopping(ie when starting the motor hen it hot) but if you give it about three quarters throttle to get it more air it starts right up. When it starts it has a nice rich smell lol.

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***Paul F*** · 06-16-2014, 04:41 PM

This is a common problem with the carbureted mercruiser engines. I 've been told that fuel evaporates from the heat while it's been sitting.

I open my sun deck for a while and let the heat out while at the beach. Another suggestion was run the blower for a little while after shutdown.

It only happens in hot weather to me.

swoodworth · 06-16-2014, 04:50 PM

I have tried opening up the throttle too while starting it but it still takes awhile to turn over...not sure what the problem is.

gahooligan · 06-16-2014, 04:59 PM

To turn over? Or it turns over fine but just won't start? if it's turning over slowly like its have a difficult time soininging the motor I would think it's possible that the starter is going bad or the connections and the heat is building resistance

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swoodworth · 06-16-2014, 05:01 PM

sorry...it turns over but doesnt start right up...I have to keep it turning over for a little bit before it will finally start up.

***Paul F*** · 06-16-2014, 06:14 PM

If you google "Mercruiser won't start when hot", you'll see you're not alone.

swoodworth · 06-16-2014, 06:36 PM

Just googled that...thanks! Was trying to decide how difficult it would be to put an inline fuel cooler or insulate the fuel lines (which seems to be the easier fix?) but haven't had much time yet to do the research.

***Hudson River Steve*** · 06-17-2014, 10:58 PM

The old hot rodder approach is to remove the mechanical fuel pump, block it off with a plate and replace it with an electric pump. The reason you have to crank the motor so long is the mechanical fuel pump has to refill the empty (boiled off) fuel bowl. An electric pump begins pumping as soon as you turn the key.