run on Vacuflush 2002 340da

• Jun 12, 2017

• #1

speakrdude

Well-Known Member

Feb 21, 2009

1,214

Northwest Arkansas

Boat Info

2002 Sea Ray 340 DA
Raymarine C80 Tri Data

Engines

twin 6.2 MX MPI

I've repaired the older version and this one seems about the same. Thought I would see if anyone else has this model rig and what you did to resolve. Just all 4 duck bills and/or the diaphragm switch? (bowl holds water, so no leak there)
Thanks.

 

• Jun 12, 2017

• #2

hottoddie

Well-Known Member

Jan 11, 2012

2,228

Boston/Cape Cod

Boat Info

1986 Sea Ray 390 EC
Garmin 4212 Chartplotter
Garmin 24 HD Radar
Garmin 546s Plotter

Engines

454 Crusaders

Does the system develop suction and flush? If it does and the pump continues to run the switch is the most likely cause.

 

• Jun 12, 2017

• #3

Mike Blake

Active Member

Jan 27, 2012

2,413

Yankeetown FL West coast

Boat Info

89 340 Sundance all Raymarine.

Engines

Gas hogs 454X2.

hottoddie said:

Does the system develop suction and flush? If it does and the pump continues to run the switch is the most likely cause.

Click to expand...

The duckbill valves are the most prime problem. The switch rarely ever goes. You can tell if the duckbill vales are junk by the way they are shaped.

 

• Jun 12, 2017

• #4

CliffA

Well-Known Member

Dec 29, 2009

4,712

Lake Norman, NC

Boat Info

2001 Sea Ray 340DA
Name: 'Happy Place'
4.5kW West. Generator
Purchased Nov. 2014
Fresh Water Use

Engines

Twin Merc. 6.2L (MPI)
640 hp (Total)
Raw Water Cooled
V-Drive Transmissions

I would start with the duck bill valves....do all 4 at the same time....you do not want to do this again any time soon...I had to replace the valves in my system.....I used an old wash cloth and rubber band to seal off the opening to the holding tank when I removed the pump to service the valves.....

cliff

 

• Jun 12, 2017

• #5

Island Time Buffalo

Active Member

Aug 19, 2014

240

Grand Island, NY

Boat Info

380 Sundancer 1999.

Engines

7.4 Horizons

I replaced the duck bills as well as the switch in mine. It still occasionally runs on, but by and large it's working great. I noticed that it tends to happen more when the tank is above the 1/2 mark.

If you do replace the valves (4) I recommend that you dump about a gallon of liquid laundry detergent down the head right before you do, it really flushes out the line and vacuum chambers pretty well. Don't use anything that makes suds. It cut down on the mess and smell quite a bit and it really wasn't as bad of a job as I was expecting.

 

• Jun 12, 2017

• #6

speakrdude

Well-Known Member

Feb 21, 2009

1,214

Northwest Arkansas

Boat Info

2002 Sea Ray 340 DA
Raymarine C80 Tri Data

Engines

twin 6.2 MX MPI

So....sounds like we are about 50/50 on the duck bills versus the switch thing!
I suppose I will change the cheapest thing first. (Duck bills) and then will see what happens.
Yes, the suction is still there and works fine.

 

• Jun 12, 2017

• #7

C

Capn Ron

Member

Nov 2, 2006

76

Lake Cumberland Ky.

Boat Info

95 330 Sundancer

Engines

454's v-drives

I had this same exact senerio. Started on duckbill valves. Rebuilt the pump. Turned out to be a bad switch. Replaced switch and all my problems went away. Good luck. It's a crappy job!