Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Paper towels
- Flashlight
- Pump manual
Step-by-step instructions
Confirm all outlets are closed
Check galley, head, shower, deck shower and any external faucet.
Inspect for obvious leaks
Look at accessible hoses, filters, fittings and the bilge for new freshwater or drips.
Check suction supply
Confirm the tank has water and strainers are maintained according to the pump manual.
Review pressure-system components
A leaking check valve, accumulator or pressure switch may cause cycling. Use the manual to identify parts safely.
Isolate and arrange repair
Turn off the pump when not needed if the system is leaking, and replace defective parts with approved equivalents.
Safety note
Turn off the pump before opening plumbing. Do not confuse freshwater leaks with seawater leaks entering through a hull fitting.
Key takeaway
Repeated cycling with taps closed usually means pressure is escaping somewhere.
Keep this job on your maintenance schedule
Save the topic as a maintenance task, choose a due date or engine-hour target, and record future service. Free and stored on your device.
Add to my maintenance plannerThis guide is for general education. Follow your equipment manufacturer’s instructions, current navigation guidance and applicable marine safety standards. When uncertain, use a qualified marine professional.