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Thanks for the input. I've just got back from Christmas break, so I haven't had time to check everything yet... I'll definitely have a go with the gravity feed idea, and when production lets up a bit I'll see if I can open the pump up and check the seals. The most puzzling thing about this...

Hi. I have a small progressive cavity pump that's playing up - liquid goes in, and liquid containing a stream of fine bubbles of an unknown colourless gas comes out. We're pumping MDI (methyl diphenyl diisocyanate), and the pump has been spec'd for chemical resistance against this. To my...