I'm looking for a cleaning solution pump for an old upright Rug Doctor
carpet & upholstery cleaner, the model EZ-1. I've got inquires out to Rug
Doctor and a couple of dealers. I got a junk machine for parts but that
one had a bad pump too and efforts to combine parts failed because the seal
material was just too degraded. This machine is probably 25 years old.

If all else fails I was thinking of just getting a small self contained
pump and stuffing it in there. Any suggestions? The OEM pump is a
centrifugal unit powered by a 120V motor that is labeled 1/11 HP 1.25 A (to
give an idea of the size).

I assume most pumps won't be too happy if you completely block the output
which is the case here when the pump is running but the cleaning button
(that turns on the spray via a solenoid valve) is not pressed...or one is
using the handtool but not hitting the trigger. The original pump has a
small recirculation hose probably for that reason. No regulation; just a
tiny connecting hose output coming off alongside the main output. I would
probably do something similar. I wonder if a small fountain pump would be
suitable.