Genuine BMW part 16 14 1 182 581: Fuel tank pressure sensor. The number stamped on the part is 16141182581; BMW's catalog files it under the short number 1182581. You will find it on our Fuel System shelf, under Delivery, control units, fuel pump.
It fits the E36 sedan, coupe, convertible and compact (318i, 318ti, 323i, 328i and M3, 1992–1999), with the M44, M52 or S52 engines.
BMW draws it on 3 diagrams, among them Plastic fuel tank (16_0205) and Expansion Tank/Tubing/Pressure Sensor (16_0214). It weighs about 34 g (under 0.1 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.