Found a barely used HRX217HYA and then a much older HRX217HXA with a serial MAGA 1036341. The reason I bring up the older one is that while both mower both start and cut great, the HXA smells like it's leaking gas. I've inspected the carb and the gas tank and there's no obvious leaks. The sniff test has me smelling gas near the carb and also near the gas tank. The HYA model has barely any gas odor in either area. How do I fix this issue other than leaving the mower outside which would shorten it's lifespan? (I'm considering ordering the newer style gas tank - maybe that'll fix the problem?)