Small self priming water pump clarification

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Forum topic by Chris posted 800 days ago 1131 views 0 times favorited 4 replies Add to Favorites Watch
View Chris's profile


188 posts in 2722 days

800 days ago

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


822 posts in 1329 days

#1 posted 800 days ago

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 890 days

#2 posted 800 days ago

Google Water cooled computer pumps might help you.

View Chris's profile


188 posts in 2722 days

#3 posted 800 days ago

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

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

View gfadvm's profile


10760 posts in 1326 days

#4 posted 799 days ago

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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