Join Date: Feb 2010
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We have just installed a Gusher 10 MK 3 Manual Bilge pump and it will not work. It was being used in the past as a transfer pump on a level installation, and worked just fine. Does anyone know how much lift this pump should have? We have checked all hoses but have not taken it apart to check the valves.
Most likely there's a problem with the check valves. If it was working properly before, taking it out of its previous location, and reinstalling it in its new location, may have knocked a stray bit of gunk so that its now between the valve and its seat. Since you have to take the diaphragm off to look at the valves anyway, look closely for cracks in the diaphragm; sometimes such cracks are far from obvious.
I seriously doubt the lift is the issue, since the specifications say it is good for 4 m (13.5 ft) of self-priming or max head. Of course, if you're using non-smooth wall hose, this will be less.
While the smoothness of the hose will influence flow rate, it should have little or no effect on the max head. Max head is a function of the vacuum that a pump can generate without any fluid in it (i.e., "dry"), with the max possible for water being about 10 meters. Since the pressure difference between the pump and the intake end of the hose doesn't really depend upon the flow rate of the air in the hose, smoothness isn't important for max head.
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