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Date: Mon, 21 Feb 2005 14:47:36 -0800 (PST)
From: James Maher <deltaflyer@prodigy.net>
Subject: Re: [FlyRotary] Re: Vapor Lock
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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There is a third option.
Seal the vent when not flying.
The vent in my fuel tank is a -4 size AN bulkhead elbow.
I screw a cap on this fitting when not running the engine.
When the cap is removed there is usually a hissing sound indicating a vacuum or pressure in the tank. This also prevents fuel vapors from escaping which can be a hazard themselves.
Jim Maher

Ernest Christley <echristl@cisco.com> wrote:

The end result is a pumping action. A very insidious and unavoidable 
one. It doesn't matter what they tank is made of. A full day's heat 
soak, followed by a full night's cooling will make the pump work. The 
only way to stop is to:
1)Live in a place without water vapor problems. Either a very dry 
environment, or one so cold that all the water sits frozen on the ground.
2)Seal the tank perfectly completely. At which point it won't work well 
as a vehicular fuel tank, but at least won't have to worry about water 
in the fuel.

>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html


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<DIV>There is&nbsp;a third option.</DIV>
<DIV>Seal the vent when not flying.</DIV>
<DIV>The vent in my fuel tank is a -4 size AN bulkhead elbow.</DIV>
<DIV>I screw a cap on this fitting when not running the engine.</DIV>
<DIV>When the cap is removed&nbsp;there is usually a hissing sound indicating a vacuum or pressure in the tank. This also prevents fuel vapors from escaping which can be a hazard themselves.</DIV>
<DIV>Jim Maher<BR><BR><B><I>Ernest Christley &lt;echristl@cisco.com&gt;</I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">
<P>The end result is a pumping action. A very insidious and unavoidable <BR>one. It doesn't matter what they tank is made of. A full day's heat <BR>soak, followed by a full night's cooling will make the pump work. The <BR>only way to stop is to:<BR>1)Live in a place without water vapor problems. Either a very dry <BR>environment, or one so cold that all the water sits frozen on the ground.<BR>2)Seal the tank perfectly completely. At which point it won't work well <BR>as a vehicular fuel tank, but at least won't have to worry about water <BR>in the fuel.<BR><BR>&gt;&gt; Homepage: http://www.flyrotary.com/<BR>&gt;&gt; Archive: http://lancaironline.net/lists/flyrotary/List.html<BR></P></BLOCKQUOTE>
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