It is unlikely that the Fountain Tavern visited by Pepys was the one in the Strand. It was more likely the older one in the Temple. The one in the Strand was new at that time (if it yet existed). It was where the Whig grandees (Churchill, Russell et al) plotted the Glorious Revolution (1688/9) that dethroned Charles II's brother, James II, and installed William III (of Orange) and their sister, Mary II, in his place.
Chart showing the number of references in each month of the diary’s entries.