Small self priming water pump clarification

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Forum topic by Chris posted 06-23-2012 05:46 AM 1578 views 0 times favorited 4 replies Add to Favorites Watch
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358 posts in 4084 days

06-23-2012 05:46 AM

Anyone familiar with whether or not the smaller marine grade self-priming water pumps respond as an on-demand pump? When i speak of smaller, I am making reference to a pump that pumps approximately 3 gallons a minute. I understand the next question may be dependent upon brand/make/model but are these pumps typically made with impellers that can withstand a momentary absence of water? Would 10-15 seconds without an inflow of water, damage the pump? I can only assume that these pumps are designed in such a manner that the impellers will not be damaged in this situation. But, I am not familiar with the smaller type pumps of this capacity?

So, if a self priming water pump is not an on demand pump than what are the distinguishing characteristics?

Also I have heard that a lot of the smaller pumps need to be mounted lower than the water source as they are gravity fed. In my situation I may need the pump to be mounted higher than the water source but have no room for a larger, high end pump to fit in this location. So I am wondering what the pumps termed that are capable of maintaining their prime when elevated above their water source, as in the case with these smaller sized pumps?


-- Chris Harrell - custom callmaker "Quacky Calls" Eastern NC.

4 replies so far

View mtenterprises's profile


933 posts in 2691 days

#1 posted 06-23-2012 10:47 AM

I think with a little more information about your secret project somebody here might just be able to help or point you in the right direction.

-- See pictures on Flickr - And visit my Facebook page -

View EdwardR's profile


66 posts in 2252 days

#2 posted 06-23-2012 01:00 PM

Google Water cooled computer pumps might help you.

View Chris's profile


358 posts in 4084 days

#3 posted 06-24-2012 12:36 AM

water cooled computer pumps is not what i was making reference to…

-- Chris Harrell - custom callmaker "Quacky Calls" Eastern NC.

View gfadvm's profile


14940 posts in 2688 days

#4 posted 06-24-2012 02:17 AM

Chris, I have several of those type pumps (weed sprayer, water system in my practice vehicle). The pumps are all mounted on the top of the tanks and don’t seem to be harmed when run dry. Mine are made by FLOWJET and pump 5 gpm at 45 psi. Mine came from Wylie Co. in Ok. City, Ok.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

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