only one needs to have vacuum applied to it
disconnect both lines fuel and vac
put the fuel line in a bottle and suck on the vac line
or if you have a syringe it will work.
you don't need much suction so thats why
they say suck on it in the manual.
oilyhans
i own a scooter shop with rentals ,sales& racing parts.
i also appraise scooters for KBB.
2003 Vino classic stage 0.75
de-reged stock variator w/8g sliding weights.
1.5k rpm springs
42mph
2005 veniceLX ~70cc~upjet~1.5k rpm springs & 7gr sliders
46mph
KeyWest de restricted~8gr slide