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Carbs and Fuel System
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Thread: Gas Tank Vents, Fuel Petcock Reply to Thread
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  Topic Review (Newest First)
08-08-2017 07:01 PM
JoelB Thank you
I found away to actuate the petcock and drain the fuel.
I also found a diagram on the fender showing where the blue line is connected to the return pump and there is a open port with a blue dot,
The same diagram shows the red line connecting to a side port on the return pump problem with that there is no open port the the return pump.
So, do you think I should cap the open port on the return pump run the vent lines straight down and open.

Easy enough, now for the carbs the bike sat for a year run occasionally to keep up the battery and move the oil around and such.
I guess I will ask is there a hassle free way to clean up the carbs without removing them,
08-08-2017 05:43 PM
ubertalldude vent tubes at the back aren't supposed to go anywhere, those are fine. the petcock is vacuum actuated, so it won't flow fuel until the engine runs. sounds like the carburetors are gummed up and may need to be cleaned given how much the bike has sat
08-08-2017 04:58 PM
Gas Tank Vents, Fuel Petcock


Well as you can probably guess I am a newbie to the Vulcan World.
I bought a 1998 VN 750 two years ago and never really got the opportunity to ride due to life. I always started it and removed the battery over winter and kept it in the garage.
I took out to show to a guy who wanted to buy it and and it wouldn't stay running in idle. I thought the gas might be the issue it being old. I rode to the gas station and filled it up added a can of gas treatment thinking I would drain the tank in the morning and flush it out as well.
While removing the tank I found the two vent hoses on the back of the gas tank were not connected to anything. where to they normally connect to ?
Also I took the tank off and attached hoses to the gas valve and turned on the petcock and no gas comes out the petcock no matter what position it is in On or RES or even off is this normal does the gas tank require a vacuum for the petcock to work?
Any advice or direction would be greatly appreciated

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