Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > RV SYSTEMS AND TECHNOLOGIES FORUMS > RV Systems & Appliances
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 08-21-2021, 04:30 AM   #1
Member
 
Join Date: Oct 2019
Location: Dewitt, Mi
Posts: 44
Dometic Vacuflush

Help needed!!!!


We have this rig for less than a year. We bought it used and there are missing documentation like the Vacuflush. Anyway, the DW flush the toilet after use, and she noticed that the Light in the VacuFlush switch was not changing to green the pump keep running. I checked the Vacuflush pump (SW series) and the bellows looked ok, there were no leak or tear on the bellow. To get matter worse, DW needed to pee and I said maybe you can still use the toilet (pee is just water), which she did. When she flush water does not go down. This is our first rig a 2014 Fleetwood Excursion. Were are camped at TT in St Clairs MI. We have a week more to go before headed home. So my questions are:
1. With the vacuflush system if the pump is not functioning do the waste from the toilet does not go down?
2. What would cause the vacupump not to stop running? After I leaned up the blellow and reassemble, I covered the exhaust of the pump with my palm and operated the pump, it seemed to created vacuum. I run it for a minute and still would not stop). When the vacupump is running and I activate the pressure sw on the tank, pump quits. So I think that the pump is not creating enough vacuum.

3. Is it time to replace the vacupump or there are still replaceable parts, I can try? What are they and wre they are located.
4. I there a way to drain the toilet?


Sun47me1208
2014 Fleetwood Excursion 33D
2019 GMC Canyon



3.
sun47me1208 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 08-21-2021, 11:06 AM   #2
Moderator Emeritus
 
TXiceman's Avatar


 
Vintage RV Owners Club
Texas Boomers Club
Oklahoma Boomers Club
Ford Super Duty Owner
Join Date: Aug 2000
Location: Full Time, TX Home Base
Posts: 20,374
Blog Entries: 21
With all the problems I see posted on these fancy electric toilets, I am thankful that I have the good old foot pedal operated gravity-drop toilet.

Ken
__________________
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot
TXiceman is offline   Reply With Quote
Old 08-21-2021, 11:21 AM   #3
RRR
Senior Member


 
Ford Super Duty Owner
Join Date: Mar 2009
Posts: 2,047
If the pump keeps running you likely have a vacuum leak. If the bellows are leaking you likely will have sewage in the compartment.

While the vacuum switch is reliable they do fail. The switch is located on the accumulator tank which is why the pump wouldn't stop running with your hand on it.

If you are lucky sometimes some of the liquid will drain without a vacuum but don't count on it.

Parts are available to rebuild the pump. https://marinesan.com/ has some diagrams on their page. Fast shipping and good phone support.

Shaving cream on the fittings will show where the leaks may be. It draws into the leak.

You said: When the vacupump is running and I activate the pressure sw on the tank, pump quits. To me that indicates problem with the vacuum switch OR you have a leak. I have manually turned the adjusting screw about 1/8 turn till I got desired results. It is not recommended so do at your own risk.

I would buy a rebuild kit that includes the bellows, gaskets and duckbill valves. You have no history of the pump, you have been into the bellows and the duckbills are the next suspect. They aren't hard to rebuild, lube the duckbills, dish soap works well, and don't over tighten. Don't overlook the slip-fit gasket that goes into the accumulator tank. Six bucks it might be worth it if you suspect it.
__________________
2016 Bounder 34T Anniversary Edition
RRR is offline   Reply With Quote
Old 08-27-2021, 07:07 AM   #4
Member
 
Join Date: Oct 2019
Location: Dewitt, Mi
Posts: 44
Dometic VacuFlush

I rebuilt the Vacuum pump. Replaced the bellow which was compressed (vs expanded) I dont see any leaks. Toilet bowl water stay in the bowl all this time. After rebuilding Vacuflush pump, even though the pump would not quit, I flush the toilet and the water on the toilet went down without the vacuum sucking noise. If the Vacuflush is running ( and I assume creating vacuum) would it still create the sucking noise even if the switch is bad? or the vacuflush pump will not create vacuum if switch is bad?

Next I might replace switch, if I cannot get any repair shop


Sun47me1208
2014 Fleetwood Excursion 33D
2019 GM Canyon
sun47me1208 is offline   Reply With Quote
Old 08-27-2021, 07:30 AM   #5
Member
 
Join Date: Oct 2019
Location: Dewitt, Mi
Posts: 44
Dometic Vacuflush

I vacuum maintained all the way to the main holding tank? or vacuum is at the toilet bowl to the secondary tank (smaller tank)


sun47me1208
2014 Fleetwood Excursion 33D
2019 GMC Canyon
sun47me1208 is offline   Reply With Quote
Old 08-29-2021, 12:34 PM   #6
Member
 
Join Date: Oct 2019
Location: Dewitt, Mi
Posts: 44
Update on this

After verifying if the pump was creating a vacuum by putting my palm to cover the inlet side tubing (in my case tubing connected to secondary tank or small tank) I found out that pump is not creating a vacuum. I disassemble the Vacuum pump generator and O.E. (operator error) found that I mis-assembled the bellows. The collar to the bellow was improperly installed. Assembled it correctly and before I installed it back I bench tested the Vacuum generator covering the inlet and powering up pump.

Anyway, the reason why the vacuum pump was not stopping was:
1) Bellow was compressed and was not creating vacuum
2) There is a leak at the fitting (rubber seal) at the inlet of the vacuum pump. The seal must have been damaged from dis-assembling the Vacuum generator


Thanks to all who helped
sun47me1208 is offline   Reply With Quote
Old 09-23-2021, 09:40 AM   #7
Member
 
Join Date: Oct 2019
Location: Dewitt, Mi
Posts: 44
Dometic vacupump

update



After finding that the vacuum pump was not creating vacuum, I tried the shaving cream method. (I can hear leak hissing but do not know where). I found that the leak was coming from the pump adapter to diptube fitting. see link. The first o-ring was rolled. A $1.46 part. replaced and now vacuum pump shut off all works

https://seacoastservices.com/pump-ad...o-diptube-fit/
sun47me1208 is offline   Reply With Quote
Old 09-23-2021, 09:54 AM   #8
Senior Member
 
77Travco's Avatar
 
Join Date: Oct 2015
Location: Texas Hill Country
Posts: 800
Installing the bellows incorrectly seems to be a common mistake. Glad you got it done! The VacuFlush systems are not as scary as people think they are. It's nice to know that you can fix it yourself.
I carry a box of brand new VacuFlush system parts in case I ever have a problem when on the road.
Just for reference, this is what I carry for VacuFlush spare parts. Most if not all, is available on Amazon or Ebay.
1) 385311462 Seal kit
2) 385318162 Ball kit
3) 385314349 Water Valve kit
4) 385310063 Floor Seal kit
5) 385310540 Vacuum Switch kit
6) 385310076 Duckbill Valves (2 kits for a total of 4 valves)
__________________
2017 Bounder 33C LX package 22K chassis
415cid V10 gasser / 6speed / Dana S130 with 5:38's
Towing 2018 F-150 Lariat 3.5EB / 10speed / 3:55's
77Travco is offline   Reply With Quote
Reply

Tags
dometic



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Bounder: Need advice regarding Dometic VacuFlush toilet rguild Fleetwood Owner's Forum 5 08-19-2018 09:11 AM
Dometic vacuflush help isneyDay Fleetwood Owner's Forum 28 08-14-2017 08:33 AM
Dometic Vacuflush running when not flushed Xman11 RV Systems & Appliances 7 06-26-2017 11:13 PM
Bounder: Dometic vacuflush sehunter Fleetwood Owner's Forum 30 08-10-2016 06:44 AM
Dometic Sealand VacuFlush Toilet System Repair fixn2gocamp RV Systems & Appliances 0 02-22-2015 03:01 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 09:52 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.