In my personal experience though, a freshwater pump failure has rarely been due to the pressure switch.
My Shurflo pump just died and it was due to the pressure switch. When I put a continuity meter across the switch it would only work about once every 20 times I pressed the switch. I sprayed it with DeoxIT D5 and mechanically agitated it (i.e. banged it a few times) and was able to get a few more days out of it waiting on the replacement to show up. Even then I had to go bang on the switch a couple of times to get it working during those few days.
But what my point is, as I was researching this, the recurring theme I found was that these pressure switches are the MAIN reason these pumps fail. Rarely was it ever due to a diaphragm/motor/etc.
With that said, I will acknowledge that the pump I just replaced was 21 years old - so I really can't complain!! Granted the boat wasn't used much before we bought it, so the actual run-time on the unit was much less. But I figure it was due for replacement so I'm not complaining!
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