Re: Johnson fuel filters advice requested… Home › Forum › Ask A Member › Johnson fuel filters advice requested… › Re: Johnson fuel filters advice requested… frankrUS Member - 1 Year (includes $3 online payment fee)Replies: 6715Topics: 51 September 16, 2018 at 8:27 pm #82985 I believe that Wizard was a common Merc filter of the day. But I don’t know the availability today. EDIT: Merc 1399-1136, replaced by 1399-3938 (Sierra 18-7832 (????)