18 hours layover at Pudong Airport is it possible for me to visit Zhujiaojiao?

Yes, you can visit the water town in these 18 hours.
You can take the Maglev Train to get to Longyang Road Station. Then take subway line 2 to Jingan Temple Station, Exit 1. After that, walk to Middle Yanan Road Huashan Road Station and take bus Special Hu Zhu Line Line to go to ZZJ Bus Station. Then walk to the scenic area. The return way is the same. The duration is 1.5 to 2 hours for the single way.

Thanks elina :)