rcmark

I have a 2001 SV650 (CA Model) and want to sync the carbs.
I have established the front carb sync (vacum) line.
On the rear carb there are a two vacum lines.
One goes from the gas tank valve to the rear carb.
One goes from the fuel pump to the fitting that holds the rear carb to the engine.
Which line do I use?
Can I put a “tee connector” into one of these lines?
Any ideas?
Thanks,