BMB Holding Tank probs?

[Margem]

Hi all
anyone had truoble with BMB holding tanks, mines not emtying very well, ancaster say its relies on gravity and is not pumped out?
All jabsco components renewed but still not good.
Any idears?

 

[jfm]

Very strange that it isn't pumped. Would have to be above the waterline, and there's unlikeely to be anywhere above waterline on a BMB where you'd want to put a tank. And the toilets would have to pump stuff up into it.

Follow the discharge pipe and see if there's a pump, then see if the pump is working. Diagnose from there

 

[Whitelighter]

BMB holdoing tanks on the 300 and 330 are in the heads compatment immediatly under the deck. They are very small volume and are indeed gravity released.