First principles: Run a hose from the intake to a bucket and then another hose on the output side to the bucket. See if it pumps water or not. If it does pump, the issue is elsewhere. Then put the hose on the seacock. If it still pumps water, the issue is downstream. Note that there is such a thing as one-way leaks, i.e they let air in but not water out. Last one of these I had was causes by a small fish that got into the pump. Joe Della Barba Coquina
From: David Knecht via CnC-List <cnc-list@cnc-list.com> Sent: Thursday, June 5, 2025 12:10 PM To: Stus-List <cnc-list@cnc-list.com> Cc: David Knecht <davidakne...@gmail.com> Subject: [EXTERNAL] Stus-List Re: Water pump mystery Hi Dennis. Did that. No apparent problem downstream. No water is getting to heat exchanger which is first thing downstream of pump. Dave Sent from my iPhone On Jun 5, 2025, at 12:05 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Focus your investigation downstream of the pump. Disconnect the hose from the discharge of the pump or the inlet to the exhaust elbow. Start the engine and observe if you have flow. -- Dennis C. Touche' 35-1 #83 Mandeville, LA On Thu, Jun 5, 2025 at 10:31 AM David Knecht via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: Eliminated many possibilities yesterday. Pump shaft turning fine. Replaced impeller. Still not pumping water. Has anyone had a priming problem? My current hypothesis is that either the pump is not self priming or the seacock is partially plugged limiting flow. Water comes into raw water strainer with lid off but no idea if it is normal rate or not. Dave Your contributions help pay the fees associated with this list and help to keep it active. Please help by making a small contribution using PayPal at: https://www.paypal.com/paypalme/stumurray All contributions are greatly appreciated.
Your contributions help pay the fees associated with this list and help to keep it active. Please help by making a small contribution using PayPal at: https://www.paypal.com/paypalme/stumurray All contributions are greatly appreciated.
