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Fuel backflow valve?

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roncarolnikko(at)hotmail.
Guest

Posted: Sat May 13, 2006 9:47 am Post subject: Fuel backflow valve?

I want to use gravity to feed my low mounted carb, but plan on a fuel pump 

to overcome the vaporlock which forms each time I fold the wings.  Does 

anyone know of a backflow valve I can put in a parralell supply around the 

pump?  That way I have the simplicity of gravity and the security of a pump 

if the need to do extreme manuevers interferes with my fuel supply.   Ron NB 

Ore



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bmwebb(at)cox.net
Guest

Posted: Sat May 13, 2006 11:23 am Post subject: Fuel backflow valve?

Ron,

Run a check valve in parallel with the pump. Plumb it such that fuel can

flow by gravity past the pump, into a T in the fuel line post pump. That

way, when you turn the pump on, it will try to force fuel backward through

the valve, and shut it off, thereby pressurizing the fuel to the motor. I

thought of doing this very same thing.



I've heard that PCV valves work in the fuel line. If not, there are a number

of fuel specific one way check valves. Try Summit Racing. Maybe ACS has one,

also California Power Supply. I think I saw one in McMaster-Carr catalog,

right with the fuel level senders.



Bradley



--

n10pg(at)neo.rr.com
Guest

Posted: Sat May 13, 2006 12:31 pm Post subject: Fuel backflow valve?

Hello Ron:

The Facet fuel pump sold by ASSC, p/n 40108 has a built-in check valve.

Sincerely,

Peter Graichen

http:/home.neo.rr.com/n10pg/kitfox.htm 



--

roncarolnikko(at)hotmail.
Guest

Posted: Sat May 13, 2006 1:26 pm Post subject: Fuel backflow valve?

Found It at ACS.  Yes I have one at home and will do some flow tests with 

it.  I do not need the check valve if the pump will free flow in the event 

of failure. Thanks Ron

[quote]From: "Peter Graichen" <n10pg(at)neo.rr.com>

Reply-To: kitfox-list(at)matronics.com

To: <kitfox-list(at)matronics.com>

Subject: RE: Fuel backflow valve?

Date: Sat, 13 May 2006 16:26:57 -0400






Hello Ron:

The Facet fuel pump sold by ASSC, p/n 40108 has a built-in check valve.

Sincerely,

Peter Graichen

http:/home.neo.rr.com/n10pg/kitfox.htm



--

roncarolnikko(at)hotmail.
Guest

Posted: Sat May 13, 2006 1:26 pm Post subject: Fuel backflow valve?

ASSC?  Will it free flow if turned off?  Thanks Ron NB Or

[quote]From: "Peter Graichen" <n10pg(at)neo.rr.com>

Reply-To: kitfox-list(at)matronics.com

To: <kitfox-list(at)matronics.com>

Subject: RE: Fuel backflow valve?

Date: Sat, 13 May 2006 16:26:57 -0400

Hello Ron:

The Facet fuel pump sold by ASSC, p/n 40108 has a built-in check valve.

Sincerely,

Peter Graichen

http:/home.neo.rr.com/n10pg/kitfox.htm

--

bmwebb(at)cox.net
Guest

Posted: Sat May 13, 2006 2:32 pm Post subject: Fuel backflow valve?

Ron,

Let me know what you find out. I'm not aware of any pump that free flows

like that. But if it does, I'm interested, as well.



Bradley



--

n10pg(at)neo.rr.com
Guest

Posted: Sat May 13, 2006 2:32 pm Post subject: Fuel backflow valve?

Hello again Ron:

Yes, the facet fuel pump will free flow with power switched off. But keep in

mind that at very high angles of attack there is very little or no head

between the tank and the engine. So, during take-off you definitely want to

run the pump. You also need the pump to purge vapor locks during hot starts.

Sincerely,

Peter Graichen

http:/home.neo.rr.com/n10pg/kitfox.htm 



--

asq1(at)adelphia.net
Guest

Posted: Sat May 13, 2006 2:32 pm Post subject: Fuel backflow valve?

I have one I bought at NAPA and put on 8 yrs ago. Plane runs fine with it 

shut down except in steep climb.

                                Larry Huntley

---

bmwebb(at)cox.net
Guest

Posted: Sat May 13, 2006 2:41 pm Post subject: Fuel backflow valve?

Sounds like I've been misinformed on fuel pump operation.



Bradley



--

rexjan(at)bigpond.com
Guest

Posted: Sun May 14, 2006 5:59 pm Post subject: Fuel backflow valve?

Hi ! Ron,

                not sure if this is the exact answer you are looking for =

but what I'm in the process of doing  is a bit similar. I am using a =

Facet  40171 pump from Aircraft Spruce. It has check valves that stop =

flow in either direction when the pump is turned off or failed. I have a =

Rotax 582 with the dual outlet DF52 pulse pump. I also am changing that =

for a triple outlet pump. I am taking two outlets from the header tank. =

One as is now through a filter to the pulse pump the second outlet =

through the Facet 40171 and another filter to the 3rd outlet on the new =

triple outlet pulse pump.  What will be happening is the outlet chamber =

in the new pulse pump will be acting as a "T" piece so either or both =

pumps can feed the carbies. Also pressure from the Facet pump won't be =

able to feed back due to the outlet valve in the pulse pump.

So long as the outlet chamber diaphram and outlet valve remain OK, and I =

will change this pump every two yearswhich is already a service =

requirement. I will be able to run with both pumps or just the pulse =

pump. If the pulse pump fails other than the outlet diaphram and outlet =

valve then I can run on just the Facet pump. The usual failure in the =

pulse pumps is the pulse diaphram.

 This setup will also give me two filters either one of which can block =

and I am still OK.

 Further I am adding an electronic Gem 205300 sensor in the top of the =

Header tank so if the fuel starts to run out in the header tank I will =

know that I only have that volume of 3 litres left and about 10 minutes =

power to land somewhere. The sensor will activate a flashing LED on the =

panel plus a beeper in my intercomm to warn me. I will be able to switch =

this off so as to get rid of the distraction.

  Perhaps you can glean some info or ideas from this.

                                                                         =

                         Rex Shaw.

rutinker(at)comcast.net
Guest

Posted: Mon May 15, 2006 7:36 am Post subject: Fuel backflow valve?

Hi Rex:



Where can I find more info on the electronic Gem 205300 sensor for the top 

of the header tank (spec's, where can it be purchased, price, etc.)?



Thanks



Rupert Tinker, Kitfox 2, under construction, Paradise, CA

---

colind

Joined: 10 Jan 2006
Posts: 32
Location: Sydney, Australia

Posted: Mon May 15, 2006 4:45 pm Post subject: Fuel backflow valve?

Rupert,



Go to www.gemssensors.com . Search by the part number and voila!.



Regards



Colin Durey

Pacific Technology Corporation Ltd

+61-418-677073 (M)

+61-2-945466162 (F)



[quote] 



 Hi Rex:



 Where can I find more info on the electronic Gem 205300 sensor for the top

 of the header tank (spec's, where can it be purchased, price, etc.)?



 Thanks



 Rupert Tinker, Kitfox 2, under construction, Paradise, CA

 ---

_________________
Colin Durey
Sydney
+61-418-677073

rutinker(at)comcast.net
Guest

Posted: Tue May 16, 2006 2:10 pm Post subject: Fuel backflow valve?

Colin:

Thanks, found the part right away.  Question:  Is this compatible with 

gasoline. (I  recall that the early models dissolved in gasoline)

Rupert



---

colind

Joined: 10 Jan 2006
Posts: 32
Location: Sydney, Australia

Posted: Tue May 16, 2006 5:02 pm Post subject: Fuel backflow valve?

Rupert,



To my knowledge they are OK for gasoline. There are two types, one made

from Polysulphone, and the other from Polyetethersulphone. One is better

than the other, but again, both are, I believe, OK.  To satisfy yourself,

you could call GEMs and ask them directly.



I use these sensors (smaller ones) in medical equipment that I work with,

so am not dealing with fuels, however, the sensor in my KF IV kit ('94

vintage) is a GEMs unit made from Polysulphone ( I don't know the original

part #)



Regards



Colin Durey

Pacific Technology Corporation Ltd

+61-418-677073 (M)

+61-2-945466162 (F)

[quote] 



 Colin:

 Thanks, found the part right away.  Question:  Is this compatible with

 gasoline. (I  recall that the early models dissolved in gasoline)

 Rupert



 ---

_________________
Colin Durey
Sydney
+61-418-677073

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