"Fuel Sending Unit" = Fuel Pump?
Try under the car, near the passenger's side rear wheel (covered by a plastic panel)
"Fuel Sending Unit" = Fuel Pump Relay?
Behind the battery, remove the plastic cover.

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1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
609 Certified