Vacuflush pump noise

[JiveMiguel]

I have a vacuflush system and noticed today that it was making a 'whump whump whump' noise. It did this continuously until I switched off the head at the panel. This sound was coming from near the holding tank. The head seems to work correctly, but this noise is new and I don't like it. I only tested the head one more time before I had to leave the boat, so I didn't have time to make extensive tests. I posted in another thread that sounded like the original poster had a similar problem, but I don't know if it will be seen or if in fact it was the same problem, so I'm posting a new thread.

Thanks in advance for any help anyone can give me!

 

[PascalG]

i have three VF... sounds varies... sometimes some of them make a clack noise, sometimes they done... try flushing a head full of water to flush everything, there might be something caught in the bellows.

 

[Davelm]

If it's coming from around the pump check that all bolts are in place and tight. A loose bolt on the pump can cause it to shake and make a thumping like noise. If that bolt works its' way into the bellows it can tear it.