I have a 1994 Mariah with a 5.0 liter Mercruiser that has trouble starting after its been driven for any length of time. Cold statrts are not a problem. If the boats sits for any length of time in non calm waters after being driven it just won't start. If the boat is on the lift - ignition is not a problem. Numerous attempts eventially runs battery down. It's as if it won't fire. Could there be a fuel flooding problem or something else. I've heard that it might be the thunderbolt ignition. I have some blow back also occuring. Any thoughts!
