Adblue(R) Pump Module, Component Description - GF49.20-P-3022A

Model 223 

with code U79 (BLUETEC (SCR) diesel exhaust treatment, generation 3) 

Courtesy of MERCEDES-BENZ USA

The numbers on the pins indicate the pin numbering of the slots.

Fig 1: Adblue(R) Pump Module Components Location - Model 223 With Code U79

Courtesy of MERCEDES-BENZ USA

Location