Fuel line to connect 4 carbs together - what size inner diameter hose to use???
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Thread: Fuel line to connect 4 carbs together - what size inner diameter hose to use???

  1. #1
    Senior Member kj7687's Avatar
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    Question Fuel line to connect 4 carbs together - what size inner diameter hose to use???

    So, I've been working on a friend's bike. Long story short, the fuel line that should connect the four carbs together was missing...just completely gone. I'm thinking I will try to cut some fuel hose and use it to connect the carbs. The problem is, I don't know what size the original connectors were (and they aren't sold independently as per the parts diagrams for the carbs). The outer diameter of the hard line that comes out of the side of each carburetor is 6 mm. I have a ~4 mm inner diameter vacuum line that seems to fit pretty well, and a ~5 mm inner diameter fuel hose that fits, but seems slightly loose. I'm concerned that the 5 mm line could leak, but don't trust the 4 mm line to hold up/not get eaten by the gasoline eventually. I am thinking to buy this: https://www.jetsrus.com/individual_p...532932_50.html . I guess I just want some kind of reassurance that 4 mm i.d. hose is reasonable to use with 6 mm o.d. outlet tube (on the carbs)...

    Of course, it doesn't help that the outlet tubes coming off the sides of the carbs are very short in length - probably 1/4", so there is also some concern of whatever hose I stick in there not necessarily staying put super well. I'm planning to cut each hose about 1 or 2 mm too long, so that the carbs push the hoses together a little and help hold them in place.
    Last edited by kj7687; 09-14-2016 at 08:04 PM.
    KJ, just KJ, ok.


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    Senior Member Smitty Blackstone's Avatar
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    If the 5mm is loose, use 4mm FUEL RATED tubing.
    littletommy and arbolmano like this.

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    Super Moderator littletommy's Avatar
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    Use the smaller tygon.
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    Senior Member kj7687's Avatar
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    Alright, thanks for the responses. I'll go ahead and order up a foot of the tubing in my link. I just wish I had another three months of summer vacation to finish this "little" project...
    KJ, just KJ, ok.


    Current rides:
    2004 GMC Sierra 1500, 1999 Toyota 4Runner

    Past rides: 2015 Yamaha XT 250, 1997 Suzuki DR 200, 2007 Honda Ruckus, 2007 Yamaha TW 200, 2007 Kawasaki Ninja 500, 2009 Kawasaki KLX331S; 1994 GMC Sierra 1500, 1987 Nissan Pathfinder, 1992 Acura Integra, 1986 Honda CRX, 1989 Jeep Cherokee, 1994 Chevrolet Astro Van, 1979 Volkswagen Rabbit, 1984 Jeep Cherokee

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    Senior Member Smitty Blackstone's Avatar
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    There is never enough time...

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