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Old 08-20-2005, 11:20 AM   #1
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NEED HELP (PUMPS)

I have a Little giant 4-MDQX on the 175 now. It started howling last week. Last Sunday, I took it off, oiled it and everything seemed just great. Now it is howling again and it doesnt sound like it will last the day. I need to get another one ordered and overnighted for Tuesday delivery.

What I need help with is finding one that is comparable in fittings but more powerful, as if I am spending the money on a new pump, it really should have a higher amount of water turnover. Does anyone have any suggestions as to a good strong reliable pump? The fittings are 1 inch in and 3/4 out.
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Old 08-20-2005, 01:02 PM   #2
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new scenario...I have in my possession a dolphin ampmaster 2100. 1.5 inch fittimgs both in and out. The marinedepot site says taking it down to 1 inch, i can lose 40%, What would happen, if anything, to the pump if i went 1 inch in and 3/4 out?
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Old 08-22-2005, 08:32 PM   #3
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BUMP! COme on guys, (this sounds like a guy question)
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Old 08-22-2005, 08:48 PM   #4
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Everything I have read says to never reduce the intake. It will cause excess motor wear & heat and severally shorten pump life. It says the same thing on dolphin site.
Here is dolphins phone number and email. Hours are 8:30 -4:30 EST
Phone: (850) 434-9880/(850) 433-1484
E-Mail Address: bestpump@bellsouth.net
Contact them and see what they say. That way there will be no regrets.
PS. I got a Dolphin 7500 and love it. Gives off a little more hot air than I expected but it is a big pump.
Now answer my question about QT tank cycle below
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Old 08-22-2005, 09:42 PM   #5
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the dolphin site that I read said it could be taken down to 1 inch with no problems, but to expect up to 40% reduced output. The problem I have is that the bulkhead fitting on the sump is 1 inch. and the return lines are 3/4...but it is 2 return lines so therefore wouldnt you consider it a total of 1 1/2 inch on the return side? I just don't know if it works that way or not.
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Old 08-22-2005, 09:52 PM   #6
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why dont you drill the holes larger so you can put a larger bulkhead in?
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Old 08-22-2005, 09:57 PM   #7
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I would at least send a email and see what they say. I can tell you that two 3/4 inch lines do not carry near as much water as a 1 1/2 inch line does (it does not work that way). A 1 1/2 pipe will roughly carry the water volume of 4- 3/4 inch pipes
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Old 08-22-2005, 10:17 PM   #8
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Quote:
Originally Posted by juskeepswiming
why dont you drill the holes larger so you can put a larger bulkhead in?
The tank can't be offline long enough to get that done, nor can the sump be removed from its position.
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Old 08-22-2005, 10:21 PM   #9
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Hara is your sump glass or acrylic? I drilled my sump this weekend in place. I added a 100gal refugium to it. It only took about 1 hr to do.
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Old 08-22-2005, 11:45 PM   #10
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I do not have anyone around that can do that and I know that "I" certainly would not attempt it. It is an oceanic glass sump.
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