How do you know it is only one tank? Show us pics of the tank valve set-up. Run a hose down the vent and wash it out..usually on top of roof...may need to be creative to get a hose past the vent top depending on type and if it can come off. Show us a pic of that too for better suggestions. Has this just started or has it happened all the time since you got it?
Have you done a tank cleansing? BTW, year make and model would help too...just saying! The more info you can supply gives folks a better chance at solving your issue. Fill in your profile always is good! Help is just around the corner.:?
