No idea on the LR3s but there is no float inside/attached to the tank on the LR4s. The float is the thin vertical black piece that the sensor is attached to. When you buy a sensor it comes with a float/sensor together. This is what the wires plug into. See two posts up for the diagram from the service manual. You do not need to replace the entire tank to replace the float, although the dealer may tell you that. They are about $15.