Robert:–Fumes or gas odor ? Your post indicates that the problem you are experiencing is present even while the heater is not on (except for the standing pilot). Could it be that what you smell is the odorant (mercaptan)that is added to the gas for obvious reasons, instead the products of incomplete combustion? I would check each and every fitting and connection in the supply piping with a soap solution for any possible leaks. It takes only a small leak to alert a sensitive nose to the odor of the mercaptan that is added for the sole purpose of alerting us that gas is present. Be sure to check the tank area..fittings..regulator..etc.as well. lots of luck..Bud
