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1. 08:42 PM - Re: Fuel pump failure (Cliff Coy)
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| Subject: | Re: Fuel pump failure |
After giving the matter a couple minutes of thought...
You could tee a Facet 40194 pump into the supply of the hand primer.
From the pump a line is plumbed to a Parker Skinner 71335SN2KNJ1
three-way solenoid valve.
Each outlet of the three way valve would be tee'd into the respective
priming line (system or cylinder).
This should be a parallel but independent system requiring no extra
check valves. (leaves the manual system operable)
Power would be supplied by a cole hersee 55094 or Philmore Datak 30-340
Progressive Toggle Switch (OFF-ON-MOM ON).
and wired such that in the regular "on" position the pump would
pressurize the carburetor.
The "momentary on" position would energize the solenoid valve to divert
the fuel to the intake manifold.
This would be a fun project. Parts would be about $200.
Cheers,
Cliff
Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E wrote:
>
>With a little thought and some minor tubing changes said pump could be
>used to replace the complete primer ... Period.
>
>The replacement would just have a toggle selector valve (system or
>prime) and an electric switch having "momentary/off/on contacts". This
>would duplicate the exact design used with the BIG radials, and would
>also act as the backup fuel pump.
>
>Better yet.... Include an electric selector valve in the design. When
>you push the electric switch to the spring loaded off "momentary"
>position, it primes. Switch it to the "ON" side and it provides system
>pressure and thus a backup fuel pump.
>
>Of course, with a total loss of electric power, the engine would then be
>very hard to start. But then, how many people really need to start with
>a 100% total loss of electrical power? A few I guess.
>
>Interesting idea.
>
>Mark Bitterlich
>N50YK
>
>
>-----Original Message-----
>From: owner-yak-list-server@matronics.com
>[mailto:owner-yak-list-server@matronics.com] On Behalf Of Cliff Coy
>Sent: Friday, October 12, 2007 17:31
>To: yak-list@matronics.com
>Subject: Re: Yak-List: Fuel pump failure
>
>
>All of the 52TW's have an electric boost pump installed in parallel with
>the "system" side of the primer.
>I'd recommend using a 40194 pump- It has both a check valve and an
>anti-siphon valve.
>This will prevent any "loopback" through the electric pump.
>
>'spruce sells the 40194 (although they don't always show it in their
>catalog)
>
>Cheers,
>Cliff
>
>viperdoc wrote:
>
>
>
>>
>>That is a GREAT IDEA that I had not thought of! Not that I have any
>>corner on bright ideas. I don't! Especially since I ops tested the yes
>>you can reassemble the fuel pump backwards!
>>Thanks.
>>Doc
>>
>>-----Original Message-----
>>From: owner-yak-list-server@matronics.com
>>[mailto:owner-yak-list-server@matronics.com] On Behalf Of Craig
>>Schneider
>>Sent: Thursday, October 11, 2007 2:48 PM
>>To: yak-list@matronics.com
>>Subject: RE: Yak-List: Fuel pump failure
>>
>>
>>I have an electric boost pump. 28V facet mounted on the firewall, in
>>fuel line before the engine driven fuel pump. Cheap investment Model
>>40164 $42.60 at Aircraft Spruce
>>
>>Don't fly without one!
>>
>>-----Original Message-----
>>From: owner-yak-list-server@matronics.com
>>[mailto:owner-yak-list-server@matronics.com] On Behalf Of John Graham
>>Sent: Thursday, October 11, 2007 1:19 PM
>>To: Yak list
>>Subject: Yak-List: Fuel pump failure
>>
>>
>>If the engine driven fuel pump fails in flight, I have heard one can
>>pump the primer lever rapidly to keep enough fuel going to the engine
>>to keep it running long enough to land the plane. Is this true? Also,
>>
>>
>
>
>
>>would one pump the handle after turning it to the left (fuel pressure)
>>or right (fuel primer)?
>>As always, thanks for your answers as I continue to learn about my Yak
>>52.
>>
>>Thanks,
>>
>>John P. Graham
>>CubFlyer1940@Yahoo.com
>>Cell phone (847) 641-1330
>>
>>
>>
>>http://smallbusiness.yahoo.com/webhosting
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