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 Diaphragm pump going bad/leaking 
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Joined: Tue Sep 16, 2014 6:36 pm
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Location: Sunrise, FL
Post Diaphragm pump going bad/leaking
I've got a 23hp van and I'm on my 3rd diaphragm pump in 4 years. They keep pumping fuel out the little hole on the top and motor runs itself out of fuel. Is this a common problem due to ethanol fuels deteriorating the inside or am I blowing a leak in it priming the line with an electric fuel pump I installed because my tank is located in the front. The pump is only a 2-4 pump. Couldn't find anything on this in a search.

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1438 Jon / 23hp MBLT


Tue Jan 09, 2018 8:36 am
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Joined: Tue Aug 26, 2014 10:36 am
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Location: Jefferson TX
Post Re: Diaphragm pump going bad/leaking
Either do away with diaphragm pump or electric one. No need for both. I have never run an electric fuel pump and the only fuel problems have been air leak and a primer bulb leak. Your electric pump might be what is causing diaphragm to start leaking, if your tank is not vented and it swells up it is putting pressure on that diaphragm also.

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Tue Jan 09, 2018 9:17 am
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Post Re: Diaphragm pump going bad/leaking
Got it. Thanks.
Do you think I can keep the electric pump just to initially prime the line still since I removed the primer ball?

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1438 Jon / 23hp MBLT


Tue Jan 09, 2018 9:31 am
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Post Re: Diaphragm pump going bad/leaking
I’d rather have the primer ball than the electric pump myself.


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Tue Jan 09, 2018 9:52 am
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Post Re: Diaphragm pump going bad/leaking
use the primer bulb to prime, and either the electric or the diaphragm pump to feed the engine. I use the Facet solid state e pump (posi flow, used to be the cube).

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Tue Jan 09, 2018 9:55 am
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Post Re: Diaphragm pump going bad/leaking
primer bulb and diaphragm pump. E pumps are not needed and are bandaids.

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Tue Jan 09, 2018 9:59 am
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Post Re: Diaphragm pump going bad/leaking
OK. Thanks again for the advise!

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1438 Jon / 23hp MBLT


Tue Jan 09, 2018 11:19 am
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