Re: Merc Mark 7

[green-thumbs]

The work around is set hex head in vise and adjust jaws to firm but not too tight. Then rotate tank to unscrew filter. Usually works when you are too impatient to drop everything to go buy a socket or box end wrench.
Really gummy fuel residue can be rendered into a jelly with lacquer thinner. It works best
in warm weather out in the sun. After a couple days pour out the jelly, separate the liquid
and return it to tank for another few days. May take 3 or 4 cycles. Strong ammonia (extra strength) can then be used to finish cleaning.
The Green Tank Mercurys have aluminum tanks made from welded together stampings.
More usually the problem with them is they are beat up from from rough treatment.
Although they can be repaired it is usually more cost effective to find a better tank.
Louis