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Andair fuel valve leaking

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ScottA

Joined: 05 Jan 2006
Posts: 100
Location: Park City, UT

Posted: Wed Sep 13, 2006 5:30 pm Post subject: Andair fuel valve leaking

Anybody else have an Andair fuel valve that lets fuel transfer from tank to tank with the valve in the off position?  

This is a L-R-Both-Off valve, FS20X4.  

   

I’ve written to Andair tech support twice with no response either time.  

   

No impressed.  

FWIW  

Scott  

       [quote][b]

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tedwaltman(at)i1ci.com
Guest

Posted: Wed Sep 13, 2006 5:39 pm Post subject: Andair fuel valve leaking

Interesting about 1) their lack of response and 2) about  the leak.  Another experienced builder gave their valves high marks.   Maybe I'll rethink out using them...

  

 Thanks for the input.

  

 Ted



   From:  owner-murphymoose-list-server(at)matronics.com  [mailto:owner-murphymoose-list-server(at)matronics.com] On Behalf Of Scott  Aldrich

Sent: Wednesday, September 13, 2006 7:30 PM

To:  murphymoose-list(at)matronics.com

Subject: Andair fuel  valve leaking

 

  

Anybody else have an Andair fuel  valve that lets fuel transfer from tank to tank with the valve in the off  position? 

This is a L-R-Both-Off valve,  FS20X4. 

  

I’ve written to Andair tech support  twice with no response either time. 

  

No  impressed. 

FWIW 

Scott

[quote]



atronics.com/Navigator?MurphyMoose-List



[b]

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ScottA

Joined: 05 Jan 2006
Posts: 100
Location: Park City, UT

Posted: Wed Sep 13, 2006 5:45 pm Post subject: Andair fuel valve leaking

I’ve always heard they were good valves – they must be as there are a lot out there?? I know Steve’s leaks also.  If you fill one tank, overnight they will be level.  

         

  

From: owner-murphymoose-list-server(at)matronics.com [mailto:owner-murphymoose-list-server(at)matronics.com] On Behalf Of Ted Waltman

 Sent: Wednesday, September 13, 2006 7:40 PM

 To: murphymoose-list(at)matronics.com

 Subject: RE: MurphyMoose-List: Andair fuel valve leaking  

  

   

Interesting about 1) their lack of response and 2) about the leak.  Another experienced builder gave their valves high marks.  Maybe I'll rethink out using them...  

   

Thanks for the input.  

   

Ted  

       

  

From: owner-murphymoose-list-server(at)matronics.com [mailto:owner-murphymoose-list-server(at)matronics.com] On Behalf Of Scott Aldrich

 Sent: Wednesday, September 13, 2006 7:30 PM

 To: murphymoose-list(at)matronics.com

 Subject: Andair fuel valve leaking  

Anybody else have an Andair fuel valve that lets fuel transfer from tank to tank with the valve in the off position?  

This is a L-R-Both-Off valve, FS20X4.  

   

I’ve written to Andair tech support twice with no response either time.  

   

No impressed.  

FWIW  

Scott   	  Quote: 	
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       [quote][b]

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KJKimball(at)aol.com
Guest

Posted: Wed Sep 13, 2006 5:54 pm Post subject: Andair fuel valve leaking

Scott,

  

 Email with Andair can be slow.  You would be better off calling Owen  and talking to him.  

  

 We have used their valves in many installations and have never had a leak  through issue.  I did hear of one install done elsewhere that had a problem  similar to what you are seeing.  It seemed like a leak through the valve  that was allowing the tanks to equalize in fuel level.  As it turned out,  the builder of that high wing airplane did not use individual vents for the 2  tanks.  Instead he tied the two tanks together to a common vent and the  fuel transfer was actually through the vent lines not the valve.  If you  have a left and right vent that are not connected, obviously, this cannot be the  problem.  If you do have the vents tied together or any other common tie  between the tanks, you may have a bypass of the valve.

  

 On another installation in a Pitts, the main tank drain and gascolator  drain were connected together to a common quick drain on the belly.  Seems  like a simplt idea to eliminate one drain valve.  The problem is that it  created a loop for the fuel around the selector valve allowing fuel to flow  although at a lower flow rate through th e1/4 drain lines.  The engine ran  and ran good enough for run up before take off.  Luckily, the pilot noticed  the fuel was off and the engine was running anyway and opted to check out why  instead of fly anyway possibly running low on fuel at take off power.

  

  

 You could test the valve and fuel system by capping the output port of the  valve.  Remove the line for one tank at the valve exposing that port.   Select the still attached tank and see if fuel leaks out the open port.  If  it does, you have a valve issue.  If not, you may have a system  problem.

  

 Hope this helps.

  

 Sincerely,



Kevin Kimball, VP Engineering

Jim  Kimball Enterprises, Inc.

PO Box 849, 5354 Cemetery Rd.

Zellwood, FL  32798

407-889-3451 phone

407-889-7168 fax

www.jimkimballenterprises.com

www.pittsmodel12.com



  [quote][b]

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ScottA

Joined: 05 Jan 2006
Posts: 100
Location: Park City, UT

Posted: Wed Sep 13, 2006 6:17 pm Post subject: Andair fuel valve leaking

Thanks for the suggestions Kevin.  I know it is not a vent issue – I do have a vent in each tank and I do have a cross vent- however the cross vent goes from the high point in the tip of one tank to the high point of the other tip (a la Cessna).    

   

Of course the valve is in a less than perfect spot to get at the lines but that is what I will have to do to check it out.  

   

Thanks again,  

Scott  

         

  

From: owner-murphymoose-list-server(at)matronics.com [mailto:owner-murphymoose-list-server(at)matronics.com] On Behalf Of KJKimball(at)aol.com

 Sent: Wednesday, September 13, 2006 7:55 PM

 To: murphymoose-list(at)matronics.com

 Subject: Re: MurphyMoose-List: Andair fuel valve leaking  

  

     

Scott,  

    

   

    

Email with Andair can be slow.  You would be better off calling Owen and talking to him.    

    

   

    

We have used their valves in many installations and have never had a leak through issue.  I did hear of one install done elsewhere that had a problem similar to what you are seeing.  It seemed like a leak through the valve that was allowing the tanks to equalize in fuel level.  As it turned out, the builder of that high wing airplane did not use individual vents for the 2 tanks.  Instead he tied the two tanks together to a common vent and the fuel transfer was actually through the vent lines not the valve.  If you have a left and right vent that are not connected, obviously, this cannot be the problem.  If you do have the vents tied together or any other common tie between the tanks, you may have a bypass of the valve.  

    

   

    

On another installation in a Pitts, the main tank drain and gascolator drain were connected together to a common quick drain on the belly.  Seems like a simplt idea to eliminate one drain valve.  The problem is that it created a loop for the fuel around the selector valve allowing fuel to flow although at a lower flow rate through th e1/4 drain lines.  The engine ran and ran good enough for run up before take off.  Luckily, the pilot noticed the fuel was off and the engine was running anyway and opted to check out why instead of fly anyway possibly running low on fuel at take off power.  

    

   

    

   

    

You could test the valve and fuel system by capping the output port of the valve.  Remove the line for one tank at the valve exposing that port.  Select the still attached tank and see if fuel leaks out the open port.  If it does, you have a valve issue.  If not, you may have a system problem.  

    

   

    

Hope this helps.  

    

   

    

Sincerely,

 

 Kevin Kimball, VP Engineering

 Jim Kimball Enterprises, Inc.

 PO Box 849, 5354 Cemetery Rd.

 Zellwood, FL  32798

 407-889-3451 phone

 407-889-7168 fax

 www.jimkimballenterprises.com

 www.pittsmodel12.com  

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