Took gas tank off... which on goes where again?

Forgot which line goes to top and which to bottom valve of petcock...

One line feeds the carbs from behind them, between carbs 1&2 and one line seems to go into the post-carb #3 boot. (Which seems odd to me. Probably won't after I finally take apart my carbs this weekend...)

Obnoxious little thing. Anyways, I don't know which petcock output is for pri and which is for on/res, so... anyone, quickly?

 

one is fuel and one is vacuum. The one that attaches to the carb boot is the vacuum line it puts pressure on a membrane in the petcock and alows fuel to flow only when the bike is turning over. Other line is fuel; on, prime, and res all feed into it. the hoses should be different diameters small is vacuum large is fuel.

 

Yes, but which is which on the petcock? Is the top tap for fuel, or the bottom? I'll go look and see if those are also different diameters, maybe that's what you're trying to say?

Edit: they are. Hard working in the dark. Ready to be done... Been 9 hours since I started this afternoon.

Edit: thank you.

 

top is carb bottom is fuel. they should be two different sizes