First time we've been in a campground that provided a free honey wagon pump out at no charge for 5 plus days stay (water and electric sites only).
Seem to recall, but couldn't find it in search, that there's a downside...but can't remember what it was.
Thanks
If they use gravity, no worries. If they use pressure to 'pull' the contents out that could be problematic. If that is their method stay inside and make sure you leave the toilet valve open (press down on the lever) during the process to eliminate the pressure.
Here you go:
Holding Tank Pump-Out Trucks (http://www.foreforums.com/index.php?topic=18923)
Google railroad tank car implosion, and watch utube, and these are steel tanks, venting is Paramount. One look at the results, and you will be a believer forever. Open the toilet valve it may release some odor but better safe than sorry. With plastic tanks even a clogged vent on a elevated dump site may flex the tanks and hoses. Good news is you probably only need about a inch of clear bore to vent. If the accordion hose starts to contract when you open the glory valve, shut it and find the problem.
Myth busters did a segment on that.
Lord, I missed that show.
Our 5 year ago posting still is our guide. We never allow a pump out, no matter how they do it. The pump out guy may or may not have perfect setup, but today, it may not be working and our plastic tank stress from vacuum can be problematic. Dumping into a large Rubbermaid container and having the pump out suck out from the container would be ok, but only a few will do it that way. They don't want a mess and we may pay the price. Also a 'new' guy working the pump out truck may not be as careful. I also don't like anyone touching our dump valves. The FREE is not free in the long run. Just move after 5 days to the dump site, also good for the coach.
Myth busters was kinda lame on that point as it was a cylindrical liquid tank, there used to be a more rectangular unvented grain car implosion floating around the web that was much more dramatic that showed results closer to what we could expect.
Our old SOB suffered from a vacuum job "service" while we were away from the rig (at a nameless, big park with rollercoasters in Ohio). The tank collapse was not evident until we were far down the road. Expensive and painful lesson learned!
Just not going to let a pump truck make a solid connection to my coach. I'll go find a dump station thanks.
Let them suck it out. Its what they do ,day after day, sucking turds , slurpin, sucking, slurpin, If Everyone else is having no problems You should not either...jmo Mine has been done quite a few times No problem .. ^.^d
As always DWMYH😎
Just make sure your not on the throne when the pump operator switches it to puree!!!!!!!!!!!!
I've had mine pumped out at least a dozen times. Some times with a little gas powered pump to a small tank other times giant dedicated commercial pump out trucks. I put a dumb bell on the foot pedal of the toilet to keep the valve open. Then open both gray & black valves at the same time. So far no problem. Don't see any shrinking of the pump out hose which tells me there is plenty of air flow.
Sometimes you do what you gotta do. Caveat emptor.
see ya
ken