* 26-gallon tank: This was the most common size.
* 33-gallon tank: Some models, likely those with extended cabs or specific packages, came with a larger 33-gallon tank.
To know for sure what size tank *your* specific 1994 Suburban has, you should:
* Check your owner's manual: This is the most reliable source.
* Look at the fuel tank itself: The capacity might be stamped on the tank (though this may be difficult to see).
* Check your vehicle identification number (VIN): A dealer or parts supplier can use the VIN to identify your specific model and its features, including the fuel tank size.
