I own a Mercury 25HP Big Foot 4 Stroke....the fuel pump is leaking so I ordered a new cover gasket and a new diaphragm. I have some of the Permatex gasoline resistant gasket sealer. Would it be advisable to use on the cover gasket??? If so, should I put the sealer in the cover and then fit the gasket into the sealer or, install the gasket in the cover channels and apply the gasket sealer over around the cover gasket. Also, should/could I use the sealer to hold the diaphragm in place while putting the fuel pump cover back on the assemble?