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bachd said..
Sorry guys. Its not that its broken or blocked. I simply don't know how to empty it. As in which pump switch or valve do i open.
I have a 2004 Mustang (3200LE). If it is the same, I have a pump out switch in the cabinet in the bathroom. Mine is a 3-way switch, up for showing tank level, mid position is nothing and down is to pump out. Hold the switch down until the tank is empty.
My holding tank is in the engine compartment. If you follow that, there is a charcoal filter and a macerator pump. Follow these pipes to the outlet and back to the dunny. You might find a seacock, make sure this is open.
If you want to pump the sh!t out at a pump-out station then open the cap (it is the one labeled 'waste') and start pumping...