Topic: 1956 Johnson QD-17 10 hp. Fuel Line Size – Antique Outboard Motor Club,Inc

This topic has 4 replies, 5 voices, and was last updated 3 months, 1 week ago by joecb.

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August 14, 2024 at 2:34 pm #289854
Rkymtn57
Are the fuel line barbs on this Carb. 1/8″ ?

I may have an air leak after doing a dual line to a single line conversion.

I thought 1/4″ would work but i may need a inline 1/8″ to 1/4″ barb reducer ?

Can I find decent 1/8″ fuel line at Amazon ? Thank you. D
August 14, 2024 at 3:41 pm #289855
crosbyman
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Canada Member - 2 Years
NAPA has most sizes

Joining AOMCI has priviledges 🙂
August 14, 2024 at 7:29 pm #289859
fleetwin
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US Member - 2 Years
It is hard to say, depends on the components/pieces you used to convert it to single line.
August 14, 2024 at 8:20 pm #289861
bobw
Participant
US Member
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
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“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."
August 16, 2024 at 3:40 pm #289895
joecb
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US Member
Sounds like you need 3/16″ , if auto parts store doesn’t have it , try a small engine/ lawn mower shop

Joe B
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1956 Johnson QD-17 10 hp. Fuel Line Size

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