[teoman]

If with a scuba tank I do not think that i will be fiddling with the distillation unit directly doing its thing in to the active pressure chamber.

Because the distillation unit will also be under a lot of pressure then, and if it is sittin on the exhaust manifold and it runs dry then the temperature increase and cycles will probably weaken the material of the dirty water reservoir (or it has to be very very thick).

Using the scuba pressure idea is a good one in my opinion, the only difficulty is constructing a reservoir that has 1 opening on top and one on the bottom that is rated to 8 bars and that has a volume of several liters (i do not have the polo, i was going to sell the ML350 but could not do it yet so now i have the ML350 (2003 LPG) and Passat 1.8 Turbo (2011).)


The other idea was a DIY spark arrestor but it has a volume of 2-3L and does not have a diaphragm inside, it is initially filled with air, so as the pump pumps water it compresses the air (orientation of this device will be important). So basically a poor mans pressure regulator. But the idea originated from the notion that the pump may not like high pressure low flow and it will switch on off too much damaging itself.