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  1. #1

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    An idea about relieving overstuffing pump water pressure.

    I've read several comments on stopping the "buck" by reducing pump overstuffing. I have an idea on where to locate the relief:

    Since I've been working on upgrading my propshaft hose, it came to me that it could work real well to place a 1 1/2" by what ever size you want to relieve with TEE between the tunnel and the intermediate shaft. Replace the hose with a TEE and hose on both ends, the tap of the TEE supplying whatever water pressure to whatever method you want to relieve the excess high speed "overstuffing" pressure with. Relieving the water pressure at this point by the propshaft would solve the problem of tapping the pump extension, or the weakening the tunnel with a hole, with the added benefit of not disturbing the flowpath of water to the pump. A stainless thinwall TEE comes to mind, as it wouldn't reduce the ID of where the pump shaft goes by more than .050 or so.
    Whatcha think?
    Could use a common adjustable water pressure relief valve, set at maybe 45lbs or whatever.


  2. #2
    '02GPRider's Avatar
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    I don't think there's any pressure in that area. The stock hose tends to collapse from the suction created by the pump and rub on the driveshaft. If there was a lot of pressure, it would balloon outward.

  3. #3
    YudLuz2's Avatar
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    Doesn't work, tried it last summer. Really not much
    to relieve there.

  4. #4
    Mr Bill's Avatar
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    But keep thinking out of the box!

  5. #5

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    Quote Originally Posted by '02GPRider View Post
    I don't think there's any pressure in that area. The stock hose tends to collapse from the suction created by the pump and rub on the driveshaft. If there was a lot of pressure, it would balloon outward.
    I believe the suction that collapses the hose is primarily at takeoff when there is no feed pressure in the tunnel from the boat moving. There should be the same positive pressure there as in the main portion of the tunnel at high speeds, however, as YudLuz2 said, maybe there is not enough volume to be had there..

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