Thursday, December 27, 2018

Fuel System - High-Pressure Pump Leaking


Fuel System - High-Pressure Pump Leaking



High-pressure pump leaking



Topic number LI07.02-N-048800



Version 1



Design group 07.02 Injection pump, unit pump, high pressure pump



Date 02-18-2010



Validity Engine 646 in model 639 and engines 642/646 in model 906



Reason for change



Reason for block



Complaint:



High-pressure pump leaking in the area of the low-pressure connections.



Cause:



Leakage at the connecting point between fuel hose and high-pressure pump connection pipe, caused by low outside temperatures.



2010 Mercedes Benz Truck Sprinter 3500 Cab (906.153) V6-3.0L DSL Turbo (642.898)



Page 107



2010 Mercedes Benz Truck Sprinter 3500 Cab (906.153) V6-3.0L DSL Turbo (642.898)



Page 108



2010 Mercedes Benz Truck Sprinter 3500 Cab (906.153) V6-3.0L DSL Turbo (642.898)



Page 109



Remedy:



Do not replace the high-pressure pump (1) !!!!



1. Check whether the poly-V belt is contaminated with fuel.



2. If it is contaminated with fuel, replace poly-V belt. (See AR13.22-S-1202S).



3. In order to localize the leak on the high-pressure pump (1), clean the high-pressure pump (1) and spray it with MB leak detector spray.



4. If the high-pressure pump (1) is found to be leaking in the area of the low-pressure connections:



^ Replace hose clamps and fuel hoses (2) of feed and return lines of low-pressure connections.



Note:



Only use the specified hose clamps.

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