Reply To: 1956 Johnson QD-17 10 hp. Fuel Line Size

[Bob Wight]

I believe the carb nipple size is actually 3/16″ and yes, if your fuel supply line from the fuel connector is larger than that, you can use an in-line barb reducer of the appropriate size.  I’ve used such a reducer on several motors that I converted from dual line to single line.  You can often find packaged short sections of fuel hose in auto parts stores or they may have bulk hose you can purchase by the foot.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."