Is a plenum required on a draw through system? I've heard yes and I've heard no. Would the fuel fall out of suspension inside the plenum?

 

No. I had an old draw through setup that had a plenum. I never used it.
After thinking about it I don't think a plenum would be a good idea on a draw through. It would give the fuel and air a place to separate. I could also be totally wrong lol.
A blow through setup would be a better all around performer.
Good luck!