Vacuflush run on question

[speakrdude]

Since I have both engines out right now, I figured I should go ahead and attack the VAcuflush "run on" problem .

The toilet flushes fine but the vaccuum pump will not shut off. I've read several articles from you folks that have mastered this (stinky) technique!

Can someone give me some instructions? It is an 88 300 Sundancer.
Thanks!

[HUMPH]

Since I have both engines out right now, I figured I should go ahead and attack the VAcuflush "run on" problem .

The toilet flushes fine but the vaccuum pump will not shut off. I've read several articles from you folks that have mastered this (stinky) technique!

Can someone give me some instructions? It is an 88 300 Sundancer.
Thanks!

Buy some new duckbills and they will have instructions and diagrams for the install. Check your hoses to see if they are good and replace if needed. Make sure all clamps are doubled and tight.

[speakrdude]

I just came across this article.

The Duck Bill Valves are the parts that allow the vacuflush system to create
and hold vacuum. There are 4 duck bill valves in each suction pump and two in
each transfer pump. They are located in the nipples where the hoses attach.
Standard maintenance on your vacuflush system is to replace every 5 years. Keep
a spare set on the boat for emergencies. These duck bill valves fit ALL pre-2006
Vacuflush pumps and are sold separately. You should order 4 for a suction pump
or 2 for a transfere pump. The symptom will be that the suction pumps turns on
and off frequently for no apparent reason. When troubleshooting this is the
first part to replace. Each sold separately.

I removed the pump out, pump a while back to replace it with a holding tank. I have 1 pump looking thing and the big white vaccuum cleaner looking torpedo. How many duckbills do I need to replace?

[HUMPH]

Pictus would be great but I would guess 4. You buy them in sets of 2 usually.

[speakrdude]

Picture of the (Dusty from new transom install) Toredo Vacuflush thingamajigger.



Picture of transfer pump maybe?

[mistercomputerman]

http://www.dometic.com/enie/Internat...sh-Technology/

[Air O'Nautical]

Picture of the (Dusty from new transom install) Toredo Vacuflush thingamajigger.



Picture of transfer pump maybe?

Top pic is the vacuum canister on the right side of the pic under the white cap on the end is a pressure switch, replace it.
Its not cheap...but IS a wear item and will fail.

Bottom pic is a vacuum pump replace all 4 duck bills.
They are in the lines on the outside of the pump.

Now start looking for a hose leak if you still have a problem or might need a new bellows.

Its all easy but, a dirty job a best.

[andyr]

There is a vacuum switch mounted into the right side of the tank. They have like a diaphragm which goes over time. Then the switch never senses that pressure is up and doesn't shut off. Have to replace switch. Check duck bills, hose clamps, and seal in toilet. If water stays in bowl, it is not the toilet seal.

[speakrdude]

Replaced the 4 duck bill valves, and found 35 CENTS!! See, it's not all bad. (however, I did throw the quarter and dime away)

[Mike Blake]

Top pic is the vacuum canister on the right side of the pic under the white cap on the end is a pressure switch, replace it.



Its not cheap...but IS a wear item and will fail.

Bottom pic is a vacuum pump replace all 4 duck bills.
They are in the lines on the outside of the pump.

Now start looking for a hose leak if you still have a problem or might need a new bellows.

Its all easy but, a dirty job a best.

I have been through all of this. The vacum switch is a lot of $$$. Most likely it is just the duckbill valves. Change those and make sure your seal in the head is holding water.