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What is the capacity of each tank?
According to the specs listed on the brochure, this is supposed to have a total of 74 gallons fuel capacity. Odd that you can only get the same gallons in each one. How did you determine that you only have 18 gallons in each tank?
Chances are good the problem is in the gauge and not the tanks. About the only other explanation would be they put 20 gallon tanks in by mistake.