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My 7.4 EFI engine will always start at the dock. However,

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My 7.4 EFI engine will...
My 7.4 EFI engine will always start at the dock. However, after it sets at anchor all day in the hot sun, it will not start. After i run the boat for about ten minutes on the other engine and circulate some air into the bilge, the dead engine will start and run without problems. Any advice?
Submitted: 8 years ago.Category: Boat
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Answered in 17 minutes by:
6/28/2010
Marine Mechanic: Outboard Guy, Marine Mechanic replied 8 years ago
Outboard Guy
Outboard Guy, Marine Mechanic
Category: Boat
Satisfied Customers: 66
Experience: Certified Mercury Outboard Tech. - 8 years experience
Verified

Hello, I'm going to try to help you.

 

I would suggest that before you turn the engines off you idle them down for a few minutes and get some cool water into them. While you are enjoying water sports, your engines, or at least your heat exchangers, will enjoy a dip in some cool lake water too.

 

The problem is that the whole engine gets hot, really hot, and when you switch off, there is a 'heat soak' period when the temperature in the internal engine and engine compartment rises because the residual heat in the cylinder/heats isn't getting cooled by circulating water.

 

Although this is less of a problem in modern fuel injected engines it still happens sometimes.

 

Give the cool down method a try and see what happens.

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