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[VAL] water pump



I am in the process of restoring a 65 Caravel. Actually I am closer to
refurbishing than restoring. Currently I am attempting to get the water
system operating. My problem is the onboard pump not working to full
capacity. Instead of delivering 4.3 gal/min, it is closer to 4.3 gal/hr! I
measured the water flow at the output of the pump in order to eliminate any
possible line blockage. I tested the inlet side and it is not blocked.
First, I found that the flappers on the check valves were glued shut by the
patina formed on the copper support. Cleaning the patina allowed the pump to
work, whereas before it did not. I inspected the diaphragm and do not see
anything that would hamper its operation, no pin holes.  There are only a
few moving parts to the thing, so it can't be too difficult to rebuild it.
Are check valves and diaphragms still available or should I find a
replacement. Better yet, does anyone have a suggestion.
Best regards, Joel --