The fuel injection device PP.M.i  MERCER represents upgrade of PP.M.i. with electronic sensors.

The pump Mi may be equipped with switches intended for control of the EGR system (exhaust gas recirculation) in relation to speed and engine load. The switches are electronic, provided with power elements, able to control the EGR electromagnetic valve without any other equipment. The solution is attractive due to its simplicity; it does not require any connection to the system of the vehicle, either. The pumps Mi equipped with those switches are called MERCER.