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Old 27 September 2016, 11:10   #1
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Country: UK - Wales
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engine water pump problems

Have just bought a new outboard engine (suzuki 8hp 2 stroke) and am having problems with the water pump. water is not being pumped through at all.

I have:

-replaced the impeller
-changed gaskets
-blown compressed air through the tubes


I know the impeller works as when i test the leg in a bucket of water with a drill turning the shaft water pumps out of the top. however the engine seems to get hot very quickly so i believe its not pumping high enough. what could i try next in order to get it working?

thanks jack
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Old 27 September 2016, 11:53   #2
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Country: UK - England
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Length: 3m +
Engine: Tohatsu Outboard
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Shouldn't be any issues with a new engine unless it's been stood for many years. Is the thermostat opening? I'm not familiar with your engine but on small mercury engines not much appears initially until it's warm. Is the pipe that takes the water to the powerhead seated properly ?
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Old 27 September 2016, 12:45   #3
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I had an 8hp Suzi two stroke a few years ago.
I found the fitment of the pump was relatively high in the leg and it had to be quite deep in a test tank before it would prime?

Is yours not cooling when the boat's afloat or are you trying it in a bucket ?

I also had to replace the thermostat on mine.....dead easy job 15mins.
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Old 27 September 2016, 13:15   #4
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My Suzuki 90 had to have the water well above the cav plate to work try deeper water
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Old 28 September 2016, 03:29   #5
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You say it's a new engine, why don't you just take it back & raise the issue with the supplier as trying to DIY is likely to void any warranty.

As raised by others, very likely that the bucket isn't deep enough. To flush my back-up - Suzuki 4hp - off the boat I use a dustbin. Length of wood in a workmate to keep the engine upright & the bottom of the skeg is in contact with the bottom of the bin.
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Old 29 September 2016, 13:12   #6
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sorry guys, the engine is used (just meant i had just bought it) sorry for the confusion i have been trying it in a deep bucket but i shall try it in a bin and get back to you all

thanks for the advice
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