It is located in the last compartment on the passenger side. You open the battery compartment door, and this one is rear to that one. You should be able to see it hanging down. It has a little plastic nut on the end. See this link for a picture, not recommending this place to purchase.
Amazon.com: Fleetguard FS1022, Diesel Fuel Water Separator: Automotive
And you don't have to empty it daily. My cummins manaul has nothing to say about it except it's number, WRV owners manual might have said daily, but if you are not fueling up, and not driving it, why empty it. Do it every month unless you get the "Water in fuel" light, then every other day until you get the bad fuel out of the tank. You can treat the tank and get rid of the water, by using a good brand of fuel additive, Styandine or Power Service, this is especially true if the rig is not going to be used for a while. But even then you should run it for 25 miles out/in at least once a month. Do a search on exerciseing the MH systems.
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