How strange, I had planned to do the same this morning myself and ended up doing a lot of maintenance/repairs on the boat. I have an older (1990) Johnson 150 that the vacuum switch had gone out on. During my troubleshooting of that I discovered I had fuel leaking from several locations so after it was all said and I done I had replaced the VRO with a regualr fuel pump, pulled the carbs and replaced the gaskets there so that I could put new clamps on all the fuel fittings.
It wasnt as good a day as fishing but Ill take a day of messing with the boat over working in the office anytime.