Mercedes Benz Truck R 320 BLUETEC Technical LI47-20_P-054504 Date: 120920
Fuel System - Cutting, Hesitation Due To Fuel Delivery
Check of fuel pump in engine 642 and engine 651
Topic number LI47.20-P-054504
Version 1
Design group 47.20 Fuel pump, filter
Date 09-20-2012
Validity Models 246; 204; 207; 212; 218; 221; 251; 164; 166 with diesel engine
Reason for change Return pressure and return quantity in attachment changed
Complaint:
Complaints of engine running characteristics (cutting, hesitation) due to possible fuel delivery issues - fuel supply from pumps to the engine.
Cause:
In the event of problems that could be attributable to the fuel pump, the voltage/current values below should be used as reference values when the
appropriate return pressures and return quantities are stabilized.
Table of values in attachment:
^ The return pressures and return quantities apply for a closed, operational system (all lines connected)
^ All pressure values are absolute values
^ Tolerance range of specified voltages (+/- 2V) and specified currents (+/- 1.5A)
Remedy:
Check whether the specified values are maintained. If the voltage or current test values deviate, the fuel pump must be replaced as per the EPC.
Mercedes Benz Truck R 320 BLUETEC
Page 21
Attachments
Symptoms
Parts
Work units
Attachment
Mercedes Benz Truck R 320 BLUETEC
Page 22
Mercedes Benz Truck R 320 BLUETEC
Page 23
This appendix refers to GI47.20-P-052889
Fuel System - Cutting, Hesitation Due To Fuel Delivery
Check of fuel pump in engine 642 and engine 651
Topic number LI47.20-P-054504
Version 1
Design group 47.20 Fuel pump, filter
Date 09-20-2012
Validity Models 246; 204; 207; 212; 218; 221; 251; 164; 166 with diesel engine
Reason for change Return pressure and return quantity in attachment changed
Complaint:
Complaints of engine running characteristics (cutting, hesitation) due to possible fuel delivery issues - fuel supply from pumps to the engine.
Cause:
In the event of problems that could be attributable to the fuel pump, the voltage/current values below should be used as reference values when the
appropriate return pressures and return quantities are stabilized.
Table of values in attachment:
^ The return pressures and return quantities apply for a closed, operational system (all lines connected)
^ All pressure values are absolute values
^ Tolerance range of specified voltages (+/- 2V) and specified currents (+/- 1.5A)
Remedy:
Check whether the specified values are maintained. If the voltage or current test values deviate, the fuel pump must be replaced as per the EPC.
Mercedes Benz Truck R 320 BLUETEC
Page 21
Attachments
Symptoms
Parts
Work units
Attachment
Mercedes Benz Truck R 320 BLUETEC
Page 22
Mercedes Benz Truck R 320 BLUETEC
Page 23
This appendix refers to GI47.20-P-052889
