Oliver | Luxury Fiberglass Travel Trailers, Campers & RVs › Forums › OLIVER CAMPERS › Mechanical & Technical Tips › Black tank flush port question
- May 25, 2019 at 11:11 am #172234
<b>Hello, I wanted to try out the black tank flush port today for the first time (using clean water on a previously emptied tank). I carefully read all of the instructions and reviewed the bathroom vent and drain diagram. Both reference a shutoff valve that must be opened before flushing the tank. I located the incoming water line under the front dinette seat, but there was NO valve anywhere. I then hooked up a hose and slowly added water which I could see (clear inlet hose) and hear water filling the black tank. When I opened the black tank tee handle at the rear, everything appeared to flush properly. My question is…..did the factory forget to install a shutoff valve or has there been a design change? I can cut in a valve, if needed. Thanks, John</b>
John & Eileen
2018 F150 EB Super Crew FX4
2018 Oliver Elite II Hull #405May 25, 2019 at 11:30 am #172237
The shut off valve you are looking for should be under the dinette seat fairly close to where that line enters the black tank. I’m not sure when the factory started adding that valve, but, I know that my Ollie (hull #117) does not have one. Given that there is a “check” valve on that line and all other signs seem to indicate that the flush worked properly – I would not worry about it. Next time you are at the factory you might want to ask about it or if it really bothers you, go ahead and cut it in yourself.
2017 Ford F150 Lariat 3.5EB FX4 Max Towing 2016 Oliver Elite II - Hull #117 "Twist"May 25, 2019 at 11:51 am #172247
I do believe that they changed the design. There was a discussion here a month or so ago about it, and some trailers have both a check valve and a manual valve, and some only the check valve.
edit – Bill seems to be a faster typer than me today. 😉
Snowball • LE2 256 • 2018 Ford RaptorMay 25, 2019 at 2:06 pm #172288
2017 Ford F150 Lariat 3.5EB FX4 Max Towing 2016 Oliver Elite II - Hull #117 "Twist"
1 user thanked author for this post.July 16, 2019 at 10:16 am #181674
I can confirm the above. We do not have a black tank flush valve either (Elite I hull#409 completed in late November 2018).
That’s good, because if we did it would be impossible to get to. I can see most of the tubing from where it enters the hull to where it enters the black tank with a flashlight and a mirror-on-a-stick, but most of it is buried under or behind the furnace and there is insufficient clearance to get a hand/arm into or around that space to operate such a valve if it did exist.
The 2019 Owner’s Manual (dated 1/8/2019) has removed the prior reference to this valve. See the “Oliver University” link under “Travel Trailers” above to download the latest owner’s manual (now a single, merged Elite I and Elite II manual).
2018 Oliver Legacy Elite #409 - 2017 Silverado 1500, 5.3L, 4x4 Z71, Dbl Cab, Std BedAugust 16, 2019 at 3:21 pm #190512
Page 75 of my 2018 owners manual shows this
The Wanderer setup
TV: 2018 Toyota Sequoia
Trailer Options: Trojan AGM Batteries, 320w Solar package, 30 Amp Convenience pkg, 2000w Inverter, Omni-directional Antenna, Dakota Fiber-Granite, Opaque cabinet doors, Flagstone flooring, KTT mattresses, Inside Basement Access, Black Marble cushions, Anderson hitch, 30# propane tanks, Front and Rear Propane Quick Connects, Truma Tankless Water Heater, Micro Air, Storage Basket, Bike Rack, Additional Awning, Custom Graphics for the trailer name
Attachments:August 16, 2019 at 4:15 pm #190521
Thanks for your reply. The illustration is very helpful, but my unit (#405) clearly does not have a valve there. Also, since there was a previous post from hull # 409 with the same findings, I’m guessing we were in the same class of not having one. Oh well.
John & Eileen
2018 F150 EB Super Crew FX4
2018 Oliver Elite II Hull #405August 16, 2019 at 7:04 pm #190536
To put this issue to rest, the factory stopped installing the valve in the black tank flush line. There is still a back flow preventer.
Steve, Tali and the dogs: Reacher, Lucy and Rocky plus our beloved Storm and Maggie (both waiting at the Rainbow Bridge) 2008 Legacy Elite I - Outlaw Oliver, HULL NUMBER: 0026 2014 Legacy Elite II - Outlaw Oliver, HULL NUMBER: 0050 2017 Silverado High Country 2500HD Diesel 4x4
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