In a gas engine carb, the fuel pressure regulator is very important. This regulator is located beneath the zinc plated steel cover of the carb.
Pressure differences near the vent hole in this cover let the engine either go lean, or rich in flicht, depending on the airflow or ram air pressure in the cowl.
It is possible to solder a small brass tube to the vent hole, and add a tube to re-locate the reference pressure to some safe place.
That may very well solve your setup problem.