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Going south towards Leshan you will want to get on a bus heading for the airport, and get off by the Homeland Hotel about 4 km before the airport. From there you turn left (with your back to the hotel), and walk over the airport express road with the heavy traffic. Soon you can get on the G4301 (ringroad), where you walk for a few km before you can turn right onto the G5. Just after the tollgate there is a gas station with a lot of cars filling up their tanks for a looong ride south who all want you to come along! Great hitching spot, although it takes some time to get there.
You can check buses going to the airport here http://www.cdairport.com/front_en/jt4.jsp I took the metro to the south railway station (2-3 RMB), from there I took a city bus 300, walked a while from the train station to find it, and they got me off the right place.
If you are going south (towards Yunnan) or west (towards Kangding and Litang), you can also get a bus to Pujiang from the Xinnanmen Bus Station located in the city center. Tickets are 27RMB (approx. $4.50). The bus station in Pujiang is a 5 minute walk to the highway where you should be able to find a ride.