Had this on our
Beneteau (Lagoon 450 cat). It was a small but visible hole from wear on the rubber of the 'valve kit' in the pump
head.
If no water present anywhere indicating a leak in the pressure side, consider this issue or a suction leak.
Pumpvendor.com has been my resource for two years to assist troubleshoot and order correct spares.
FYI, they outlined spares in order of failure to be:
1. Pressure Switch
2. Valve Kit
3.
Diaphragm Kit
4. 'Head Structure' fatigue (plumbing or screw fittings)
5.
Motor failure.
Most accumulator
tanks are grossly undersized.
Pressure switches can be bypassed indefinitely by:
1. Leave the OEM pressure switch in place to maintain water seal.
2. Disconnect the red/positive wire running from
motor to pressure switch (cut it at pressure switch)
3. Add a 'Well Pump Pressure Switch' at your desired system pressure parameters ($20-30usd, replacement contacts $12usd, Amazon. Good for tens of thousands of cycles)
4. Wire red/positive wire from pump motor to 'Well Pressure switch' then onto the 12/24v terminal as before. 'Well Switch/Cutout' can be located anywhere on the pressure side of the pump, but before a hot water
heater with check valve. Placed near the pump you'll have no issues.
5. Check voltage with pump running at 12/24v terminals to confirm adequate voltage WHEN pump is cycled on.
No more
Jabsco Garbage switch failures...