finally got around to turning the 15 gallon tank in the jeep:
into a 19 gallon tank:
yup literally the only difference on a TJ between the two is that little ~5" piece of plastic. That sticks down lower into the tank blocking off the vent when the fuel level rises and it shuts off the pump. You can sit there and do a top off up to 19 gallons but it takes forever.
Gas gauge will just read on full for an extra 4 gallons now since it isn't working buying a new sender. It only comes with the fuel pump not as a stand along so its 200-300 bucks depending on the source, don't need the pump with the diesel so not worth it.