EVAP system

Just recently bought this truck and attempted to smog twice. First time due to high hydrocarbons during idle, so I replaced the O2 sensor and weather-checked fuel lines. Second time due to needing fuel cap replaced and high hydrocarbons with engine running.
I appreciate the vacuum schematic, but am unsure how to check them. They look okay, and are connected. How do I test the solenoids? I had replaced the PCV valve when I changed the oil, spark plugs, distributor, rotor,
and wires previous to the first smog test.
Other websites showed a large canister under the truck in front of the fuel tank, but it was a much newer truck. My vehicle-knowledge is limited so I need simple instructions. The smog tech suggested that I replace the gasket underneath the carburetor, but to blow smoke into the vacuum system to locate the leak. Does that make sense?
Also worth noting is that the previous owner did some repair/replacement of the fuel pump in the fuel tank. To accomplish this he cut open the truck bed. There is an open port. Shouldn't some tube go to it? I am including pictures, I hope they help.
I attempted to send pictures as an email but need an email address. I am not tech-savvy.