RE: zdz 40 RV carb
I had the exact same no fuel into the cylinder with my ZDZ 40 that you are having. I contacted Troy Built models they advised me to buy a WT201carb, Troy Built sells the carb and does some sort of mod on it, I don't know what they were evasive about that info, anyway 50.00 later and it seems to run fine, this was only a month ago, so you might want to contact them they should have the carb you need.