[RalphG]

Thanks for that info. It sounds logical that the 52 would only require one grommet. In fact I did find one of my old ones today but it is a bit hard and brittle from age and not sure if will survive the stretching required to go over the filler neck. Also notice the difference between Mercury and Ford/Meteor gas tanks. The Ford tank has a vent pipe running along the top of the tank right up the outside of the filler neck. The Mercury does not have that.