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5/16" barb to 3/8" barb adapter

 
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Ken O



Joined: 05 Mar 2014
Posts: 110
City/Region: West Yellowstone
State or Province: MT
C-Dory Year: 1990
C-Dory Model: 22 Cruiser
Vessel Name: Ravens' Roost
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PostPosted: Tue Jan 18, 2022 7:11 pm    Post subject: 5/16" barb to 3/8" barb adapter Reply with quote

This may seem trivial, but does anyone know of a source for a 5/16" barb to 3/8" barb gasoline fuel line adapter (brass preferred)? I cannot find one anywhere (except questionable ones on Amazon). I don't want to put gasoline in questionable fittings. Last year I replaced all fuel lines with new 5/16" ID lines, which meets the spec for my older Honda BF90. I want to install a fuel flow sensor, and the recommended Navico unit has 3/8" barbs. This unit should be installed after the fuel filter/water separator. I can easily change out the "out" fitting at the filter, but I want to keep most of my fuel lines the same size, so I need to get back down to 5/16" to get to the motor. All I need is one adapter, but I can't seem to find one. Any ideas? Thanks!
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colbysmith



Joined: 02 Oct 2011
Posts: 4523
City/Region: Madison
State or Province: WI
C-Dory Year: 2009
C-Dory Model: 25 Cruiser
Vessel Name: C-Traveler
Photos: C-Traveler and Midnight-Flyer
PostPosted: Tue Jan 18, 2022 8:41 pm    Post subject: Reply with quote

Check out a local hardware store that has a large selection of fittings. Also, can you find a 5/16" fitting that will go right into your fuel filter base? I do see both brass and stainless steel barbed fittings that are 5/16" x 3/8" on Amazon. I think they would be fine.
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thataway



Joined: 02 Nov 2003
Posts: 20778
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
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PostPosted: Tue Jan 18, 2022 9:35 pm    Post subject: Reply with quote

There are direct adaptors hose barb 5/16 to 3/8 in nylon (Although nylon is resistant, I don't use it in fuel lines) and brass. Another way to do it is to get the 5/16 and the 3/8 barb to 1/4" pipe thread and a close coupling and made your adaptor.

For the fuel flow, I have just just put a fine mesh filter in line before the turbine flow meters. That works fine. They are concerned about larger debris. Same for fuel pumps.

You do have to be sure that the directions for "up" and fuel flow direction are followed.

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Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
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forrest



Joined: 02 Nov 2003
Posts: 381
City/Region: Chehalis
State or Province: WA
C-Dory Year: 2007
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PostPosted: Tue Jan 18, 2022 10:29 pm    Post subject: Reply with quote

If you heat up the 5/16 hose in a pan of boiling water, you might be able to slip it over the 3/8 barb.
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Ken O



Joined: 05 Mar 2014
Posts: 110
City/Region: West Yellowstone
State or Province: MT
C-Dory Year: 1990
C-Dory Model: 22 Cruiser
Vessel Name: Ravens' Roost
Photos: Ravens’ Roost
PostPosted: Wed Jan 19, 2022 9:35 am    Post subject: Reply with quote

Thanks for the helpful thoughts. I did finally find an adapter at my favorite hot rod shop:

https://www.jegs.com/i/JEGS/555/15946/10002/-1

This part is intended for fuel lines, so I'm OK there.

BTW, Jegs is not a marine supplier by any means, but they have been a very good vendor to deal with for anything automotive.
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