When I was flight instructing I was walking past one of our students trying to start a c 150 on the line when his engine caught on fire
Saw a similar thing. The POH drill called for fuel valve to OFf. Problem was the female student did not have the hand strength to turn the fuel valve off because like so many Cessna 150/152, the fuel valve was fully jammed in the open position because of disuse. The owner of the aircraft spat the dummy if pilots wrote up the defect because he claimed it cost him money to get an engineer to fix it. So you couldn't turn the fuel off in event of engine failure and forced landing or fire. Any Pprune readers currently flying Cessna 150/152 should check the ease of operation of the fuel valve cock as they inevitably jam up with lack of use. Then if you get a fire on start up you may not be able to turn off the fuel valve.