The 1999 Ford F-250 with a 7.3L diesel engine typically comes with a fuel tank capacity of either 29 gallons or 38 gallons, depending on the specific configuration and options chosen. Most commonly, the 29-gallon tank is found in standard models, while the larger 38-gallon tank is often available in extended cab or Super Duty versions. Always check the vehicle's manual or specifications for confirmation.
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