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Yes, they are in-the-tank pumps. I have both in my sump tank.
On Wed, 17 Mar 2004 09:56:06 -0500, Joseph M Berki wrote
Perry,
Are the Mazda pumps submersible? Would like to mount them in the sump.
Joe Berki
At 06:42 AM 3/17/2004 -0800, you (Perry Mick) wrote:
>Al Gietzen wrote:
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>>Perry wrote:
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>>If you are flying and running only one h.p. fuel pump, and that pump >>fails, the engine will become silent only milliseconds later!
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>>This is interesting. As my circuit diagram is currently configured, I >>have a pressure switch in the fuel system which automatically turns on >>the backup pump if the pressure drops below about 30 psi. (don t remember >>now the exact setting on the pressure switch). Do you suppose that this >>wouldn t react fast enough to keep the engine running?
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>> There is a manual bypass so I can turn the pump on if I want. The >> idea was to turn on both pumps for takeoff, but at other times the >> backup would automatically kick in to keep the engine from stopping if >> the primary pump stopped; thereby avoiding rapid heart rates on the part >> of pilot and passengers.
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>>Al
>That's an excellent idea Al. Probably the best solution. The engine >stutters and dies as pressure drops below 20 psi.
>
>I just run both pumps all the time. (I get nervous if I turn one off, even >at altitude). I can tell if one has failed because the pressure is >slightly lower with only one pump on. Those Mazda pumps are extremely >reliable. I use two junkyard pumps that probably had 100k+ miles in cars >previously. No failures yet. I've also owned three 2nd gens with probably >200kmiles accumulated between them and no failures yet.
>--
>Perry Mick
><http://www.ductedfan.com>http://www.ductedfan.com
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