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[Rhenaya]

I just built a Screwpump and Ubend, "For SCIENCE!", and can confirm that magma will be pressurized (ie flow upwards) after being pumped:

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this will help but you will need some bauxite gears to fill the pipe with magma down, or else the pump wont get any power (and axels will burn away)

[numerobis]

Science! has demanded a followup study, with results now on the wiki. Executive summary: Only magma actually being pumped into a 'full' tile exhibits pressure effects. I suspect what is happening is that the code for the screw pump includes 'if the target tile is full, place fluid elsewhere as per pressure' and doesn't check for what fluid is being pumped.

Oh, yeah, I've been noticing pumps do that with water.  Put a pump that draws from sea level - 2 and pumps it to sea level - 1, then one that pumps to sea level + 1, and you'll see this beautiful diamond of 7s emanating from the upper pump until suddenly you realize maybe "Galveston" wasn't an auspicious name for your fortress.