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Clouds of grey smoke and suphur smell when diesel engine starts

I have a ford mermaid 300 tubo plus diesel engine fitted to my boat and while it runs very well it is extremely smoky when it starts first and amoky a little when warm and idling

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Try checking the fuel injectors to see if they are leaking.

Posted on Feb 02, 2009

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How do l fix an outboard motor that runs fine for about 5 minutes at full throttle and then abruptly stops and will not start until it sits for awhile?


Check that the priming bulb is fitted with the arrow pointing in the directions of flow to the engine. Make sure the vent is open on the fuel tank. Check all fuel lines for kinks or blockage. If none of that fixes it, you need a marine engineer to check the fuel pump and carbs.

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Where are the engine codes located on a 1970 Pacemaker 45' boat. Where are Boat Identification codes located on pre 1972 boats? Specifically this Pacemaker?


With a boat 44 years old, your boat engines may have been replaced or at minimum, overhauled. You might resubmit your question with some easy information you can add:

Gasoline or diesel engines?
Many were Crusader engines & you can usually see the name like this on the top portion of your engines.
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Check your hoses, o-rings (if, any) and all connections. Possible pin-hole in the fuel line. Check all engine connections for possible leaks and proper torque. Good Luck.

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Disconnect the block heater. There should be a 6-8AWG cable running along the top of the engine. This heater is needed only in extremely cold climates. They may smoke a bit more, but your voltage should remain steady between 12-13VDC.

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Fuel mix is likely, ensure manufactures specs are followed when mixing. Most modern 2 stroke outboard engines run on 100 to 1 mix, unlike older ones that ran on 50 or 33 to 1.

Cheers, Timo.

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They used to check oil for water by dripping a drop on a hot surface, if it sizzled it had water in it, If it smoked , it was just oil. I would do the water test and then find the leak if you have water in there, Hope this helps.

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Can I place an in line bulb primer on a yamaha 2 stroke watercraft, it will not start when cold withoutv starter fluid. Also it seems to smoke alot when idling.


First - Never use starting fluid on a 2 stroke engine. It could wash the oil off the bearings and cause the engine to seize. Try using WD-40 to start it when it is cold. Another thing to try is getting a spray bottle and put your mix gas in it - then spray that into the carb to get it started.

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1 Answer

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