BC Black Base Pump Question

Discussion in 'Construction' started by tgalx3, Jul 5, 2023.

  1. tgalx3

    tgalx3 Well-Known Member

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    I feel like I monopolizing all the categories on this forum with my questions over the last couple weeks. Sorry about that.

    I have a black base BC pump in my Bismarck. I got it working today really nicely. However, on the left side of the base, there’s a 1/8” hole and it’s spraying out a lot of water as the pump is running inside the boat. There is still a lot of water coming out of the outflow. What is this hole used for? Can I plug it up to stop the spraying of water all around the inside of the boat?
     
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  2. bsgkid117

    bsgkid117 Vendor

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    Air bleed hole. It should've come with a brass pipe plug looking doodad that had a small 1/16 or smaller hole drilled in it. You can plug it, but then drill the appropriate small size hole for air bleed.
     
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  3. tgalx3

    tgalx3 Well-Known Member

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    Can I use this and cut the barbs off?

    image.jpg
     
  4. Justin Ragucci

    Justin Ragucci Well-Known Member

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    image.jpg

    This is how it is supposed to look and what it should of came with.
     
  5. tgalx3

    tgalx3 Well-Known Member

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    yea definitely didn’t get anything like that with the pump base.
     
  6. Kotori87

    Kotori87 Well-Known Member

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    That is the priming hole. It prevents air binding by allowing the air bubbles to vent out. It's supposed to have a plug in it so it's only spraying a small stream of water. The fitting you showed should work if you cut off the barb. I'll also check my toolbox to see if I have any of the original fittings from my BC pumps. I ended up replacing the original priming plugs with a different priming solution due to space concerns. It's hard to fit a big-*** pump in a teeny-tiny predreadnought...
     
  7. tgalx3

    tgalx3 Well-Known Member

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    I cut the barb off and drilled the hole with 1/16” drill bit. Haven’t tested it yet but looks the same as the official part, minus the flat head notch.
     
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