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Can anyone tell me where the water separator that needs to be drained is?
I looked in the manual it says there is one but not where it is
 

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Don't have a XD yet, but in your diesel supplement manual page 6-9. Page 541 of the pdf, they point underneath the truck, midway the rear door on the conducter side.
 

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It is on the drivers side, on the inside of the frame rail near the back of the cab. It is yellow in colour and on the bottom of your fuel filter housing. The picture in the owners manual is looking up towards the housing if you were laying underneath the truck.
 

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I already have referred to the owners manual. It doesn't say anything about how often this should be done. Just shows how to do it.
 

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See Chart/ Section 9 Page 8 Titan XD owner's Manual

Chart Says:
Change Filter and Drain Water every 10,000 miles.

Note 5 says to change both Stage 1 and Stage 2 Filters each interval.












 

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Dont worrie about draining it( unless you are running really bad farmer fuel lol)
I have never drained any of my Cummins filters. The only time I drain is when I'm doing a service, but that is only on the filter housing on the engine, there is a drain on that one that needs to be open to change the filter.
Just change the fuel/water separator out at service time and you will never have an issue.
 
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