Re: 1989 40 HP Merc Hard to Start

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August 4, 2015 at 3:34 pm #21529
Don
Participant

    US Member

    Well, no merc guy is replying so I will chime in. Are you saying the engine will start OK hot after sitting if you pump up the primer bulb? If so, I would just primer the bulb before starting hot to avoid excessive cranking. It is not uncommon to have to choke a hot engine after it sets for awhile, especially in hot weather, this is referred to as "heat soak" or "vapor lock".