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Old 09-01-2016, 03:33 PM   #1
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Default Bilge pump won't stop running

So on my 2003 2100 SD the Bilge pump is constantly running and killed my battery over night. Could this be caused by it getting clogged up, or do I need to start looking for a replacement?
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Old 09-01-2016, 04:43 PM   #2
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Well if the pump is running and moving water there is nothing wrong with it. The pump gets power from two sources; the helm switch or the float switch. I am assuming you did not leave the helm switch on so the float is either suck up or internally shorted.
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Old 09-01-2016, 06:02 PM   #3
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If it's an intermittent start/stop over and over again, it could be water in the drain hose running back down into the bilge and tripping the float (or sensor). That will cause it to start up to try and push that drain back water outside.

If you have a back flow valve (not really recommended) on the drain line, then this will not happen.
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Old 09-01-2016, 06:32 PM   #4
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Probably a stuck float ...Manipulate it and see if it stops running. If not, a new pump is a cheap solution.
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Old 09-01-2016, 09:31 PM   #5
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Not exactly your set up is, however I have the float separate away from the pump. If this is your set-up then it would appear that your float switch is stuck closed. Similarly, if you have a one piece construction the same condition may apply.
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Old 09-01-2016, 09:32 PM   #6
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Could someone please advise what the RPM's would be most suitable for a Mercruiser 5.7 L engine, Thanks,
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Old 09-01-2016, 09:39 PM   #7
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Quote:
Originally Posted by Fred 1956 View Post
Could someone please advise what the RPM's would be most suitable for a Mercruiser 5.7 L engine, Thanks,
You should start a new thread for this topic. Also not sure I understand the question, are you asking the WOT for this engine? 4400-4800 rpm.
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Old 09-01-2016, 09:49 PM   #8
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Thanks for the reply's, I' m going out after work to mess with it. The pump constantly runs even after i turn power off to the boat.
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Old 09-02-2016, 01:53 AM   #9
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The bilge pump is hard wired to the battery. Even if you turn the switch off it will still run. I'd replace it to get a fresh start.
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Old 09-02-2016, 04:19 AM   #10
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Quote:
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The bilge pump is hard wired to the battery. Even if you turn the switch off it will still run. I'd replace it to get a fresh start.
It is directly wired but through a float switch which is either stuck in the up position or internally shorted and this needs to be fixed first. A bilge pump is designed to run dry without damage.
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