Signs of fuel in petcock vacuum pipe.

[Mary Hinge]

I've recently run the bike up a few times after a rebuild using a remote fuel tank to visibly check to leaks & balance the carbs etc., whilst doing so I had the petcock vacuum pipe on carb #3 plugged with a bolt. When I removed the bolt ready to connect to the petcock once the tank had been refitted I noticed it seemed to be moist with fuel, not running/dripping out but visible, in the end of the pipe. Is this normal & nothing to worry about or something that needs checking out ? Thanks 👍

[tatu]

I've recently run the bike up a few times after a rebuild using a remote fuel tank to visibly check to leaks & balance the carbs etc., whilst doing so I had the petcock vacuum pipe on carb #3 plugged with a bolt. When I removed the bolt ready to connect to the petcock once the tank had been refitted I noticed it seemed to be moist with fuel, not running/dripping out but visible, in the end of the pipe. Is this normal & nothing to worry about or something that needs checking out ? Thanks 

Visable as a dampness in the tube you mean? That is supposed to be a vacuume pipe so shouldn't be wet at all... But doesn't sound like anything to worry about, are the float levels all ok?

[Maddevill]

You sure it's fuel ? Could just be condensation from running.

Mad

[tom203]

Me, I’d suck on the petcock vacuum line and see if fuel follows.....petcock diaphragm could be failing

[Mary Hinge]

Appreciate your thoughts, just to be clear the pipe wasn't connected to the petcock and the was a small amount of fuel in the end when I unblocked it after running the engine up for while using a remote tank. I just can't think how or why it'd be there when the vacuum is pulsing/pulling (I've checked it) in the opposite direction, seemed to run fine, strange huh 🤷*@%^$♂️