We also have a 17FQ but can't say we've ever "heard" the gas running for the fridge. Usually we start the fridge and listen for the clicking sound of the igniter. If everything is running correctly it's several clicks then a quiet "foom" as the gas lights. At the start of the season it can take awhile for gas to purge any air out of the propane line.
Having said that... you do hear gas running when the stove burners are on. Any chance the knobs are slightly on?
I agree with others that anytime you smell raw propane turn the tank valve off and have it checked out by a professional.
Barry, MSgt, USAF, Ret. & Rose
2015 Nissan Frontier V6
2014 Coachmen Viking 17FQ