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For whatever it's worth... I have one Carter pump in service. It's an old one, perhaps 25 years old, and it has been working fine. I have another car with a Airtex pump, been there about 10 years, no problems. Then, One more car that has had 5 Airtex pumps in the last couple years. Two came from napa, three from a local parts store in Airtex boxes, all look like the same pump. And, of these 5, four have failed, all within 1000 miles. I'm wondering 'what's up' - I have about zero confidence in this one car, and the pumps are a pita to change on the road. About the noise... These Airtex pumps make a 'clicking' sound, and it never seems to change. I would expect the clicking to slow down as the pressure builds against the float valve, but no, they keep on clicking the same, no matter if the carb is full or empty.
This is likely of no help to you - just sympathy. I am wondering though, the Carter pump you are using, is it the same as Airtex and Napa? I think the parts guy showed me a Carter pump once, and it looked identical to the Airtex and Napa ones. Are they all the same?? If so, you have my total sympathy. (And, no real answer.)
JMO
(yes, the pumps I speak of are 'cylindrical-looking', inlet & outlet on either end)