Ultrasonic fuel sending unit

My fuel gauge isn't working and I noticed in the searay schematic, it mentions an ultrasonic fuel sending unit. I didn't unscrew the 5 bolts, but there a black cap on the top of the fuel unit. Does anyone know how to mess with this type? I'm not sure if this is a traditional type since I've

Thermo King ULTRASONIC FUEL SENSOR from Thermo King of Mid Canada

Ultrasonic Fuel Tank Level Sensor - Oil & Diesel - Thincke

Ultrasonic Fuel Level Sensor-Tenet Auto Electronics Limited-Dedicated to Instruments and Sensors

Ultrasonic fuel sending unit

Exmark Repair Part 116-0003 - Fuel Level Sending Unit, 12 Gal

Wanna know what your vehicle's fuel level is? Ultrasonic Fuel Level Sensor monitors it all.

Marine Fuel Sending Unit 6 inch (150mm)240-33 ohms, Boat Fuel Tank Sending Unit and Fuel Gauge, Stainless Steel Fuel Gas Sender Water Level Gauge Sensor for Boat RV Truck : : Automotive

Ultrasonic Tank Sender

Ultrasonic Fuel Sensor - Thermo King Eastern Canada

UltraSonic Fuel Sensor - Thermo King

UltraSonic Fuel Sensor

Ultrasonic Fuel Level Sensor-Tenet Auto Electronics Limited-Dedicated to Instruments and Sensors

Ultrasonic Fuel Tank Level Sensor,Digital Diesel Oil Gauge