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Water pump not sucking |
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Tbarile 
Groupie 
Joined: May-10-2020 Location: Indiana Status: Offline Points: 55 |
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 Topic: Water pump not suckingPosted: September-06-2022 at 10:23am |
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I have an 02 ski Nautique with the GT40. Went to ski this morning and boat overheated. Immediately assumed it was the impeller but when I took the pump apart the impeller was in great shape. Reinstalled and it’s still not sucking water. I’ve check hoses and all seem right. What am I missing?
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desertskier
Platinum Member 
Joined: December-19-2006 Location: Az Status: Offline Points: 1115 |
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Posted: September-06-2022 at 10:50am |
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I had an impeller failure recently. The impeller looked fine but the bonding between the rubber and the metal hub had failed so the impeller wasn't spinning just the hub. A few other members have experienced this failure also. Otherwise you may have an air leak between the pump and the pickup. Do a forum search. Lot's of cooling system info on this site.
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92 SN - Owned since 93
99 Pro Air 89 SN - Went to live on a lake in Texas 75 Donzi 16 - Sold in 93 |
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KENO
Grand Poobah 
Joined: June-06-2004 Location: United States Status: Offline Points: 11112 |
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Posted: September-06-2022 at 2:10pm |
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Hook a hose from your pump suction to a 5 gallon bucket of water on the floor of the boat and start the engine.
You'll know very shortly after that if the pump is working.  It pumps roughly 5 gallons/minute at idle It'll at least tell you if the problem is pump related or is an air leak or blockage before the pump
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