IFI injected quantity control function - GF07.12-P-3137H

ENGINE 605.910 in MODEL 202.125

ENGINE 605.960 in MODEL 202.128 /188

ENGINE 605.912 in MODEL 210.010 /210 /610

ENGINE 606.912 in MODEL 210.020

ENGINE 606.962 in MODEL 210.025 /225

ENGINE 606.961 in MODEL 140.135

ENGINE 605.962 in MODEL 210.015 /215

Fig 1: Identifying IFI Injected Quantity Control Function

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

IFI [ERE] injected quantity control function

Zero delivery (A)
Fuel returns via the vertical groove at every stroke.
Partial delivery (B)
Control edge opens return line after partial stoke.
Maximum delivery (C)
Effective stroke corresponds to highest possible delivery quantity.
Fuel delivery ends when the control edge meets the feed and control bore. The rotation of the control plunger by the control rod allows for variable port closing.
Advanced end of delivery = low injection quantity
Retarded end of delivery = high injection quantity
When the vertical groove of the pump plunger and the feed and control bore are in line, pressure can no longer be built up and fuel delivery ceases. This condition is present when the engine is turned off or during engine braking (zero delivery).