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If you're not getting fuel to the carb, then the vacuum line you're talking about comes from the backside of your carb and feeds vacuum to both the VOES switch and the vacuum operated petcock. The VOES is either up in the tunnel of the fuel tank or on the choke cable bracket. The nipple for the vacuum line on the petcock is on the backside of the petcock. The nipple for the vacuum line at the carb or intake should be visible is you look at the backside of the carb from the left side of the bike.
The big one is the gas line which goes to the petcock.
The smaller one is a vacuum line which also goes to the petcock.
That is a vacuum operated petcock, which works off the vacumm off the intake side of the carb.
the intake side is the engine side, the other side of the carb is airbox side.
There should be a nipple sticking out of the carb on top on the intake side.
If not then the nipple is on the intake boot itself, on top.
The intake boots are on the engine side of the carb and the airbox boots are the opposite side.
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...
They are fuel overflow hoses, and just hang down under the engine. If they are not vacume or fuel lines, then they must be the overflow pipes, one from each carby.
there should only 2 lines from the fuel tap, one for fuel, and the other for vacume, the smaller diameter hose is the vacume, and the larger hose is fuel. fuel hose will go to carby, and the vacume hose to the carby inlet manifold.
put air cleaner back in the airbox as it is needed to create proper vacuum.blowing pressurized air into the openings on the carb could cause the float needle valve to stick to the seat.make sure your control cables are not in a bind, make sure fuel flows to the carb with pressure from pump (not just gravity feed)
on the radiator support, you'll find the vacuum diagram , easy as a road map to read, for some. If this is a replacement engine, go with the basic line configuration of; vacuum advance, automatic tranny vacuum line, temperature controls if vacuum operated, fuel tank canister. Don't be surprised to see you can block a number of vacuum fittings off the carb. If emissions is an issue, you will want to google the info. List the name, make, model and search on google for the vacuum diagram
I have the same problem on a 2006 Honda Shadow Sprit VT 750
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