I pulled mine out the other day, since the gland keeping water out from the exterior was rotted and the hose at the discharge was well gone by. But I left it on the boat. I'll have a look, but I've been working on the assumption it is a Mk V. I had a Whale Gusher on another boat, but it had an aluminum case. I was perusing rebuild kits and replacement pumps the other day. I saw one that moved 17.5 gpm but can't remember what it was. I also looked into the Edson and that baby pushes $1000. And a lot of water. I'm thinking rebuilding the (black plastic case) pump I've got and adding another one somewhere.
My Bristol 35 (Alden, not 35.5) had a deep bilge that would hold a lot of water. I saw it fill a couple of times (usually operator error), but the Whale Gusher (yellow case) would empty it after awhile. There is so little bilge in the T37 that, if necessary, I'd like to be able to move water. Quickly. The Bristol had stacked automatic pumps on a 3.5' aluminum bar into the deep bilge. 500 gph auto spitter low and a 1500 gph with a float switch a few inches higher. Then, in the very bottom of the bilge, a 1500 on a manual switch by the companionway, along with the Whale Gusher. Overkill, I know, but I sank the boat once by nicking the shaft log with a sawzall during haul out cutless replacement. I can't remember if I didn't notice it or it looked like the stern gland would cover it. Maybe 1/2" long. Dummy. The boat, with 5'6" draft settled into the slip mud after launching after a couple days, just above the waterline, floating the floorboards. Instead of turning on the pumps, dummy started the MD2B to keep the batteries up, which immediately sucked water from over 6" away into the air intakes and pooched the venerable Volvo. As soon as I hit the compression releases I saw the water shoot into the engine. I shut it off immediately, but too late. She got a brand new 3YM30 a few weeks later. And a new shaft log fabrication. My credo now is act quickly, after VERY quickly assessing and reassessing actions. Don't just start the engine.
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