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Old 09-25-2014, 01:15 PM
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Quote:
Originally Posted by Lambeau View Post
I see the one fill point near the oil filter housing but can't find the other fill point. Do both points need to be filled?!
Here are some pics and diagrams

DEF system


The nossle near oil filter is for the passive tank. As shown in diagram above, the tank itself is pretty far down in the middle of the vehicle.


Here's the opening for active tank:


Experienced DYIers (lcapital, or zetatre) recommend never opening the Active tank to avoid debree and oxidation getting to it. Instead, always keep the Passive tank full (not wait for the 999 mile warning). That way, he passive tank never gets empty and thus sensor has no chance to get exposed to air. A few people have big problems with sensor getting encrusted with DEF after exposure to air.

Quote:
Originally Posted by lpcapital View Post
After discovering that the only serviceable filter in the SCR system is between the passive and the active tank, I decided to leave the active tank sealed and closed and only refill the passive tank and let the transfer pump move the fluid. That way the active tank only gets fluid that has gone through a filter...

Last edited by seattle; 09-25-2014 at 01:25 PM.
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