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Fuel valve siphoning across?

 
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philperry9



Joined: 23 Nov 2011
Posts: 348

PostPosted: Sun Jun 10, 2018 3:02 pm    Post subject: Fuel valve siphoning across? Reply with quote

I had a first time experience this weekend. We flew into Tradewind airport (Amarillo) for the weekend and I parked the airplane on a ramp that was slightly sloped.

Topped off the tanks, tied it down, and left it for a few days.

We got ready to leave today and I popped open the uphill-most tank to inspect fuel levels and a good amount of fuel had disappeared. My first thought was that it was stolen.

The downhill tank was full to the rim and dripping fuel at the vent. Judging from the stains, it appears fuel was dripping out of the vent the entire weekend.

So, apparently I was cross feeding fuel from the uphill tank to the downhill tank, then from the downhill tank out the vent line to the ground.

I topped off the uphill tank with 2.8 gal. When full, the vent on that tank dripped fuel, so I knew it’s was not blocked.

The only path would be leakage inside the andair fuel valve body.

I have always left the fuel valve on the last tank used, as opposed to moving it to the off position. It just seems safer that way as it’s one less thing to miss that could kill you.

Here’s the question, have any of you see siphoning across the andair fuel selector valve in the -10? Is that normal or am I dealing with a leaky valve?

Phil
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rleffler



Joined: 05 Nov 2006
Posts: 644

PostPosted: Sun Jun 10, 2018 3:21 pm    Post subject: Fuel valve siphoning across? Reply with quote

I would have thought that to be physically impossible.


Even with a tank selected, the fuel path is to the engine, not the other tank.


Keep us posted on what you find.



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From: owner-rv10-list-server(at)matronics.com <owner-rv10-list-server(at)matronics.com> on behalf of Phillip Perry <philperry9(at)gmail.com>
Sent: Sunday, June 10, 2018 7:00:22 PM
To: rv10-list(at)matronics.com
Subject: Fuel valve siphoning across?


--> RV10-List message posted by: Phillip Perry <philperry9(at)gmail.com>

I had a first time experience this weekend. We flew into Tradewind airport (Amarillo) for the weekend and I parked the airplane on a ramp that was slightly sloped.

Topped off the tanks, tied it down, and left it for a few days.

We got ready to leave today and I popped open the uphill-most tank to inspect fuel levels and a good amount of fuel had disappeared. My first thought was that it was stolen.

The downhill tank was full to the rim and dripping fuel at the vent. Judging from the stains, it appears fuel was dripping out of the vent the entire weekend.

So, apparently I was cross feeding fuel from the uphill tank to the downhill tank, then from the downhill tank out the vent line to the ground.

I topped off the uphill tank with 2.8 gal. When full, the vent on that tank dripped fuel, so I knew its was not blocked.

The only path would be leakage inside the andair fuel valve body.

I have always left the fuel valve on the last tank used, as opposed to moving it to the off position. It just seems safer that way as its one less thing to miss that could kill you.

Heres the question, have any of you see siphoning across the andair fuel selector valve in the -10? Is that normal or am I dealing with a leaky valve?

Phil






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PostPosted: Sun Jun 10, 2018 3:40 pm    Post subject: Fuel valve siphoning across? Reply with quote

If you leave a 90 degree throw Andair fuel valve in between the left and right tank, it will (somewhat) cross connect the tanks.
Carl

On Jun 10, 2018, at 4:19 PM, Bob Leffler <bob(at)thelefflers.com (bob(at)thelefflers.com)> wrote:
Quote:
I would have thought that to be physically impossible.


Even with a tank selected, the fuel path is to the engine, not the other tank.


Keep us posted on what you find.



Get Outlook for iOS


From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) <owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)> on behalf of Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)>
Sent: Sunday, June 10, 2018 7:00:22 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Fuel valve siphoning across?


--> RV10-List message posted by: Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)>

I had a first time experience this weekend. We flew into Tradewind airport (Amarillo) for the weekend and I parked the airplane on a ramp that was slightly sloped.

Topped off the tanks, tied it down, and left it for a few days.

We got ready to leave today and I popped open the uphill-most tank to inspect fuel levels and a good amount of fuel had disappeared. My first thought was that it was stolen.

The downhill tank was full to the rim and dripping fuel at the vent. Judging from the stains, it appears fuel was dripping out of the vent the entire weekend.

So, apparently I was cross feeding fuel from the uphill tank to the downhill tank, then from the downhill tank out the vent line to the ground.

I topped off the uphill tank with 2.8 gal. When full, the vent on that tank dripped fuel, so I knew it’s was not blocked.

The only path would be leakage inside the andair fuel valve body.

I have always left the fuel valve on the last tank used, as opposed to moving it to the off position. It just seems safer that way as it’s one less thing to miss that could kill you.

Here’s the question, have any of you see siphoning across the andair fuel selector valve in the -10? Is that normal or am I dealing with a leaky valve?

Phil






Sent from my iPhone
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ums.matronics.com
===========
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matronics.com
===========
p; - List Contribution Web Site -
p; -Matt Dralle, List Admin.
http://www.matronics.com/contribution
===========







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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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neilekins(at)aol.com
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PostPosted: Sun Jun 10, 2018 3:43 pm    Post subject: Fuel valve siphoning across? Reply with quote

Yes I believe I have also. Tank levels get different depending on how plane is parked. I always Shut valve off now. Neil

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Quote:
On Jun 10, 2018, at 7:00 PM, Phillip Perry <philperry9(at)gmail.com> wrote:



I had a first time experience this weekend. We flew into Tradewind airport (Amarillo) for the weekend and I parked the airplane on a ramp that was slightly sloped.

Topped off the tanks, tied it down, and left it for a few days.

We got ready to leave today and I popped open the uphill-most tank to inspect fuel levels and a good amount of fuel had disappeared. My first thought was that it was stolen.

The downhill tank was full to the rim and dripping fuel at the vent. Judging from the stains, it appears fuel was dripping out of the vent the entire weekend.

So, apparently I was cross feeding fuel from the uphill tank to the downhill tank, then from the downhill tank out the vent line to the ground.

I topped off the uphill tank with 2.8 gal. When full, the vent on that tank dripped fuel, so I knew it’s was not blocked.

The only path would be leakage inside the andair fuel valve body.

I have always left the fuel valve on the last tank used, as opposed to moving it to the off position. It just seems safer that way as it’s one less thing to miss that could kill you.

Here’s the question, have any of you see siphoning across the andair fuel selector valve in the -10? Is that normal or am I dealing with a leaky valve?

Phil






Sent from my iPhone





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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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philperry9



Joined: 23 Nov 2011
Posts: 348

PostPosted: Sun Jun 10, 2018 5:14 pm    Post subject: Fuel valve siphoning across? Reply with quote

This one was in the detent, but I highly suspect it was leaking between the ports in the valve body housing.
Sent from my iPhone

On Jun 10, 2018, at 6:38 PM, Carl Froehlich <carl.froehlich(at)verizon.net (carl.froehlich(at)verizon.net)> wrote:
Quote:

If you leave a 90 degree throw Andair fuel valve in between the left and right tank, it will (somewhat) cross connect the tanks.
Carl

On Jun 10, 2018, at 4:19 PM, Bob Leffler <bob(at)thelefflers.com (bob(at)thelefflers.com)> wrote:
Quote:
I would have thought that to be physically impossible.


Even with a tank selected, the fuel path is to the engine, not the other tank.


Keep us posted on what you find.



Get Outlook for iOS


From: owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com) <owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)> on behalf of Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)>
Sent: Sunday, June 10, 2018 7:00:22 PM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Fuel valve siphoning across?


--> RV10-List message posted by: Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)>

I had a first time experience this weekend. We flew into Tradewind airport (Amarillo) for the weekend and I parked the airplane on a ramp that was slightly sloped.

Topped off the tanks, tied it down, and left it for a few days.

We got ready to leave today and I popped open the uphill-most tank to inspect fuel levels and a good amount of fuel had disappeared. My first thought was that it was stolen.

The downhill tank was full to the rim and dripping fuel at the vent. Judging from the stains, it appears fuel was dripping out of the vent the entire weekend.

So, apparently I was cross feeding fuel from the uphill tank to the downhill tank, then from the downhill tank out the vent line to the ground.

I topped off the uphill tank with 2.8 gal. When full, the vent on that tank dripped fuel, so I knew it’s was not blocked.

The only path would be leakage inside the andair fuel valve body.

I have always left the fuel valve on the last tank used, as opposed to moving it to the off position. It just seems safer that way as it’s one less thing to miss that could kill you.

Here’s the question, have any of you see siphoning across the andair fuel selector valve in the -10? Is that normal or am I dealing with a leaky valve?

Phil






Sent from my iPhone
===========
Email Forum -
-List">http://www.matronics.com/Navigator?RV10-List
===========
p; - MATRONICS WEB FORUMS -
ums.matronics.com
===========
p; - NEW MATRONICS LIST WIKI -
matronics.com
===========
p; - List Contribution Web Site -
p; -Matt Dralle, List Admin.
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===========








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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Lenny Iszak



Joined: 23 Mar 2008
Posts: 246

PostPosted: Sun Jun 10, 2018 5:34 pm    Post subject: Fuel valve siphoning across? Reply with quote

Was it hot outside? I live in Florida and this happens to me often. The plane is red and black, fuel in the tank gets hot, expands and just drips out the vents.

Lenny
Quote:
On Jun 10, 2018, at 9:11 PM, Phillip Perry <philperry9(at)gmail.com> wrote:

This one was in the detent, but I highly suspect it was leaking between the ports in the valve body housing.

Sent from my iPhone

On Jun 10, 2018, at 6:38 PM, Carl Froehlich <carl.froehlich(at)verizon.net> wrote:

> If you leave a 90 degree throw Andair fuel valve in between the left and right tank, it will (somewhat) cross connect the tanks.
>
> Carl
>
> On Jun 10, 2018, at 4:19 PM, Bob Leffler <bob(at)thelefflers.com> wrote:
>
>> I would have thought that to be physically impossible.
>>
>> Even with a tank selected, the fuel path is to the engine, not the other tank.
>>
>> Keep us posted on what you find.
>>
>> Get Outlook for iOS
>> From: owner-rv10-list-server(at)matronics.com <owner-rv10-list-server(at)matronics.com> on behalf of Phillip Perry <philperry9(at)gmail.com>
>> Sent: Sunday, June 10, 2018 7:00:22 PM
>> To: rv10-list(at)matronics.com
>> Subject: Fuel valve siphoning across?
>>
>>
>>
>> I had a first time experience this weekend. We flew into Tradewind airport (Amarillo) for the weekend and I parked the airplane on a ramp that was slightly sloped.
>>
>> Topped off the tanks, tied it down, and left it for a few days.
>>
>> We got ready to leave today and I popped open the uphill-most tank to inspect fuel levels and a good amount of fuel had disappeared. My first thought was that it was stolen.
>>
>> The downhill tank was full to the rim and dripping fuel at the vent. Judging from the stains, it appears fuel was dripping out of the vent the entire weekend.
>>
>> So, apparently I was cross feeding fuel from the uphill tank to the downhill tank, then from the downhill tank out the vent line to the ground.
>>
>> I topped off the uphill tank with 2.8 gal. When full, the vent on that tank dripped fuel, so I knew it’s was not blocked.
>>
>> The only path would be leakage inside the andair fuel valve body.
>>
>> I have always left the fuel valve on the last tank used, as opposed to moving it to the off position. It just seems safer that way as it’s one less thing to miss that could kill you.
>>
>> Here’s the question, have any of you see siphoning across the andair fuel selector valve in the -10? Is that normal or am I dealing with a leaky valve?
>>
>> Phil
>>
>>
>>
>>
>>
>>
>> Sent from my iPhone
>> ===========
>> Email Forum -
>> -List">http://www.matronics.com/Navigator?RV10-List
>> ===========
>> p; - MATRONICS WEB FORUMS -
>> ums.matronics.com
>> ===========
>> p; - NEW MATRONICS LIST WIKI -
>> matronics.com
>> ===========
>> p; - List Contribution Web Site -
>> p; -Matt Dralle, List Admin.
>> http://www.matronics.com/contribution
>> ===========


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 400 hrs
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PostPosted: Mon Jun 11, 2018 2:41 am    Post subject: Fuel valve siphoning across? Reply with quote

I’m in Florida also. Yes it happens to me to. I thought I was crazy. Couldn’t figure how that can work. My fuel pulls from the side I want when on left or right. But it will go to other side while sitting in hot hangar. I’m in Florida also

Sent from my iPhone

Quote:
On Jun 10, 2018, at 9:32 PM, Lenny Iszak <lenard(at)rapiddecision.com> wrote:



Was it hot outside? I live in Florida and this happens to me often. The plane is red and black, fuel in the tank gets hot, expands and just drips out the vents.

Lenny


> On Jun 10, 2018, at 9:11 PM, Phillip Perry <philperry9(at)gmail.com> wrote:
>
> This one was in the detent, but I highly suspect it was leaking between the ports in the valve body housing.
>
> Sent from my iPhone
>
>> On Jun 10, 2018, at 6:38 PM, Carl Froehlich <carl.froehlich(at)verizon.net> wrote:
>>
>> If you leave a 90 degree throw Andair fuel valve in between the left and right tank, it will (somewhat) cross connect the tanks.
>>
>> Carl
>>
>>> On Jun 10, 2018, at 4:19 PM, Bob Leffler <bob(at)thelefflers.com> wrote:
>>>
>>> I would have thought that to be physically impossible.
>>>
>>> Even with a tank selected, the fuel path is to the engine, not the other tank.
>>>
>>> Keep us posted on what you find.
>>>
>>> Get Outlook for iOS
>>> From: owner-rv10-list-server(at)matronics.com <owner-rv10-list-server(at)matronics.com> on behalf of Phillip Perry <philperry9(at)gmail.com>
>>> Sent: Sunday, June 10, 2018 7:00:22 PM
>>> To: rv10-list(at)matronics.com
>>> Subject: Fuel valve siphoning across?
>>>
>>>
>>>
>>> I had a first time experience this weekend. We flew into Tradewind airport (Amarillo) for the weekend and I parked the airplane on a ramp that was slightly sloped.
>>>
>>> Topped off the tanks, tied it down, and left it for a few days.
>>>
>>> We got ready to leave today and I popped open the uphill-most tank to inspect fuel levels and a good amount of fuel had disappeared. My first thought was that it was stolen.
>>>
>>> The downhill tank was full to the rim and dripping fuel at the vent. Judging from the stains, it appears fuel was dripping out of the vent the entire weekend.
>>>
>>> So, apparently I was cross feeding fuel from the uphill tank to the downhill tank, then from the downhill tank out the vent line to the ground.
>>>
>>> I topped off the uphill tank with 2.8 gal. When full, the vent on that tank dripped fuel, so I knew it’s was not blocked.
>>>
>>> The only path would be leakage inside the andair fuel valve body.
>>>
>>> I have always left the fuel valve on the last tank used, as opposed to moving it to the off position. It just seems safer that way as it’s one less thing to miss that could kill you.
>>>
>>> Here’s the question, have any of you see siphoning across the andair fuel selector valve in the -10? Is that normal or am I dealing with a leaky valve?
>>>
>>> Phil
>>>
>>>
>>>
>>>
>>>
>>>
>>> Sent from my iPhone
>>> ===========
>>> Email Forum -
>>> -List">http://www.matronics.com/Navigator?RV10-List
>>> ===========
>>> p; - MATRONICS WEB FORUMS -
>>> ums.matronics.com
>>> ===========
>>> p; - NEW MATRONICS LIST WIKI -
>>> matronics.com
>>> ===========
>>> p; - List Contribution Web Site -
>>> p; -Matt Dralle, List Admin.
>>> http://www.matronics.com/contribution
>>> ===========







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