Can you open them up and find the points of failure? Multiple pumps doing this points to a likely problem elsewhere, unless you can pinpoint the reason for failure.
Last one that failed on me was a plastic pivot piece inside. China part. Replaced it with a Carter that was metal components instead. A carburetor requires very little pump pressure so your failure inside the pump should be pretty obvious.
I agree with your take, but it has a new filter in the carb, a recently replaced the sock in the tank and at the same time I replaced the lines
when it first broke down I thought for sure it was the carb filter again, but no luck.
I havent opened them up, but put gauges on them and was manually pumping to check pressures
seems like most either have a weak diaphragm/inlet-outlet reed valves or are missing the return orifice
the Carter was only pumping 4psi with the return blocked off
One of the Delphi pumps was producing 7psi with the return blocked, but with the return open it was just pouring fuel back into my container.
I used fuel compatible clear tubing so I could see where the fuel was going.
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