Hi everyone.

I have a gasoline 7FGU25 that has been running rich for a while and progressively gotten worse. It loads up with fuel and stalls if under heavy load. In my opinion it's vacuum related and seems like there's a torn diaphragm somewhere that's dumping fuel directly into the vacuum side and gets worse the harder you accelerate. I know nothing about forklifts so would appreciate some guidance as to where to start looking. I looked at the carb briefly and noticed a handful of vacuum lines but didn't spend any time tracing them out. I run a marine repair shop so we are handy but just not forklift experts! Any info is appreciated. Thanks