My jeep was in a side impact crash and the fuel pump was trashed. I pulled the tank and pump, but cannot figure out the size of the tank, the supply houses say there are 15 gallon and 19 gallon sizes, 19 being the option and the pumps are different. How do I know which one I have. I can't seem to determine and can't find a part number reference page to verify my part number. any suggestions?