Model FG40K
S/N AF29C20310

First off, unit is dual fuel. Went to bring it in the shop today so i can rebuild a mast cylinder. Found a crank/no start concern. it tries to start and even smells like propane from exhaust some. Even though it has a full bottle, I swapped just in case. same thing. crank/no start. Even thoughi didnt see any obvious selector switch for fuel, I added a few gallons of gasoline in case it was empty. Still crank/no start. Has spark. Seems to be getting some fuel given I can smell what appears to be propane in the exhaust.

Any suggestions? Is there a fuel selector switch hidden somewhere so i can run it off gas only or at least try to?