Re: Source for Mercury KF5 Gas Cap? Home › Forum › Ask A Member › Source for Mercury KF5 Gas Cap? › Re: Source for Mercury KF5 Gas Cap? kirkpReplies: 240Topics: 16 March 11, 2018 at 6:51 pm #72366 Not sure if this will help or hinder your search. Literature I have says that the same cap was used on the KE4, KE7, KF3, KF7, KG4, KG7, KH7, Mark5 and Mark7. Kirk