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Old 01-27-2011, 02:19 PM   #1
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Default MArch 809 Problem - Losing Prime

Like the title says, I've got a March 809 that keeps losing it's prime. I can't possibly see how it is a plumbing issue on the rig and the pump worked fine for a while. I bought it from a buddy who used it for about two years and I've been using it about two years. It is the circing pump for my HERMS so it gets pretty heavy use.

I am about 99% sure it is simply a matter of a part wearing out but... I'm not sure which part.

I was guessing if I tossed it out there, someone would almost instantly say something like, "Oh yeah, the XXXXXX always wears out, just grag one and you should be fine".

... so... anyone got any experience with this?

Thanks.

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Old 01-27-2011, 03:09 PM   #2
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More than likely your grain bed becomes compacted and this can cause the pump to cavitate and lose it's prime. The cure is to stop the circulation and stir the grain bed thoroughly, then resume circulation. Repeat as necessary. This may not be the cause of your problem, but it's the first thing I would look at. I seriously doubt that there is anything wrong with the pump.

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Old 01-27-2011, 03:14 PM   #3
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There is something wrong with the pump. It loses prime when there's no grain in the rig at all. It'll pump just plain water for about 30 seconds and you can hear it lose the prime.

It started happening here or there about two months ago and has gotten progressively worse since... until now... where it'll only pump for about 2 seconds before losing the prime.

There are no clogs anywhere, I've cleared everything a couple of times.

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Old 01-27-2011, 03:15 PM   #4
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I have a brand new pump and it does the same thing.

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Old 01-27-2011, 03:20 PM   #5
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I gotta take the thing apart and check it out. I was really hoping someone would just say, "Oh yeah... it's XXXXX"

the pump worked perfectly for well over year. The plumbing is extremely direct, not clogged... and again... worked perfectly for over a year. My other March 809 (got two on my rig) works perfectly.

This one started acting up and like I was saying above, has slowly gotten worse and worse to the point where it just doesn't pump at all.

... and again... this is with zero grain in the rig. That pump is plumbed to do two things... 1) circ the grain bed and 2) sparge from the HLT (obviously no grain bed) and it acts the exact same way with both sources.

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Old 01-27-2011, 03:26 PM   #6
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Mine isn't as bad as yours it sounds like.

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Old 01-27-2011, 03:26 PM   #7
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When was the last time you took it apart for maintenance? Cleaning and such?

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Old 01-27-2011, 03:27 PM   #8
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"Oh yeah... it's XXXXX"

I would contact Walter from march pumps, he's on here and even gave out his number in another thread.

http://www.homebrewtalk.com/f11/marc...6/#post2579288


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Old 01-27-2011, 03:29 PM   #9
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Any chance you have an air leak in your plumbing causing the pump to pull air w/the liquid?

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Old 01-27-2011, 03:31 PM   #10
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The March 809 loose prime if they get a sniff of air. If it runs for 30 seconds than stops.....you probably have a small leak that's allowing air to get into the pump. I use an autovent on mine and I still have to stop and start the pump once or twice to get it to pump constantly. Do a search, a lot of threads on here about this.

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