Mack MP8 - Misfilling Diesel or Aftertreatment Diesel Exhaust Fluid (DEF) Tanks

Misfilling Diesel or Aftertreatment Diesel Exhaust Fluid (DEF) Tanks
Although diesel fuel and aftertreatment DEF caps are clearly labeled and filler necks and nozzles are different accidents can
happen.
Contamination of fluids by misfilling of diesel or DEF in the wrong tank may result in vehicle malfunction.
Results of misfilling DEF in diesel tank
• Engine may run poorly or not at all
• Injectors may be damaged
• On board diagnostic (OBD) diagnostic trouble codes (DTCs)
• Exhaust system corrosion may occur between turbocharger and aftertreatment DPF
• Costly repairs
Results of misfilling diesel in aftertreatment DEF tank
• Aftertreatment selective catalytic reduction (SCR) system may be damaged by Diesel
• SCR catalyst may be damaged by diesel (chemical damage)
• Emissions may be non-compliant
• OBD DTCs
• Costly repairs
Note: DEF tank has a magnetic interlock and fuel station DEF fluid dispensing nozzle with a magnetic valve, have to meet to
prevent from dispensing into anything other than the DEF tanks.
Notes
Mack Body Builder Instructions CHU, CXU, GU, TD, MRU, LR
USA139046859 Date 5.2017 Body Builder; Engine, MP7, MP8, and MP10 Page 35 (43)
All Rights Reserved