On Thu, 11 Apr 2013 17:28:25 -0500, Ignoramus19459
wrote:

I have a question, I have a diaphragm pump here and I have never used
one before. When I supply air to this particular one, it seems to work
internally, but there is barely any suction or pressure on either
end. Maybe just a tiny amount of suction.

I thought that they can run dry and do not need priming.

What should I expect from a good diaphragm pump?

i
Likely to be worn or sticking valves. Unless the diaphragm has a hole
in it :-(

--
Cheers,

John B.