Page last updated July 17, 2008



Carburetor Schematic


Mercury 700 Fuel System Maintenance





Continuation of breakdown. It really is not hard at all and can be done with engine on boat.



Removed most of gasket with flattened piece of copper tubing (plumbing section at hardware store, hammer flat and then sharpen with file). Copper will usually not leave scratches since it is softer than parent metal, then I applied gasket remover and after letting soak in, A wire brush was used to loosen the muck


Trash bags and some tape. I need a lot to go before it is sealed.

Try to avoid laying block on its side, keep in an upright position, this will aid in keeping harmful materials from falling into cylinder bores.


Another pic of area. Try to seal off the area as best as you can. Try to avoid laying it so that area is facing up (contamination will happen)

Again, try to keep block on its side with fuel area perpendicular to platform that way junks falls on table and NOT inside bores.


Once both parts are clean, apply a light coat of gasket sealant (has to be fuel resistant) and ensure it is not so thick, especially in the area where the fuel pump sits. Just has to be enough to create a better seal and as thin as possible. Ok, mine is a little too thick, but I plan on taking it apart when all maintenance is complete / engine running to give it a complete paint job.


After it is in place, apply head bolts and hand tighten. Torque according to manufacturer recommendations. Should only be a little past hand tight; you don't want to blow gasket due to overtorqueing. Let gasket sealant / prep cure according to manufacturers recommendations. Don't try to start without letting the sealant will fail! Have patiance my young padawan.

11. Ready and next will be the fuel diaphram housing. Coming Soon! (Ok, its been over a year, may not be that soon) Its a simple gasket replacement. If you did this, you already have it off, might as well do it.




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