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There is no "diagram" showing the whole routing of fuel lines in the bike. You need to use different diagrams in Fuel System section of the service manual. Fuel system section starts at page 15 in service manual, but what you really need starts at page 40. I have posted fuel service manual at the end of comment.
There is one forum where users discussed the routing. One user has colored the diagram from service manual to indicate lines routing. Here the diagram:
"The red and yellow are the fuel lines that go to the petcock. The green
one you left unmarked also goes to the petcock. The line with a question
mark is a vacuum line that connects to a part in front of the battery
along with the larger lines to the cylinders."
The '82 Yamaha Vision only has one fuel line coming from the carb to the petcock and a vacuum line running from the petcock to the front carb manifold. An in-line fuel filter between the carb and petcock is reccomended...
The '82 1/4" fuel line goes from the petcock to the carb....(install an in-line fuel filter between them)...with a vacuum line going from the petcock to the vacuum off take, located on the front carb rubber manifold, (the smaller of the two brass tubes!!).
You should also go to www.ridersofvision.net A web site for Yamaha Vision owners...
The 83 has a fuel return line intended to prevent vapor lock , by circulating cooler gas through he fuel pump. You can cap off the fuel return hose and it will cause no problems. The carbs on the 82 differ quite a bit from the 83 and the petcocks are not interchangeable, with out a lot of work.
I don't think there's an exhaustive list on this. My bike had troubles until I replaced the fuel lines (hoping that solved it), but my 82 Vision has had no problems.
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