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Date: Mon, 15 Aug 2011 01:37:37 -0400
From: Ernest Christley <echristley@att.net>
Reply-To: echristley@att.net
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Dennis Haverlah Fuel System...or any others,
 for that matter.
References: <list-5092112@logan.com>
In-Reply-To: <list-5092112@logan.com>
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On 08/15/2011 01:27 AM, Ernest Christley wrote:
>
> I removed the 4 screws, wrapped up the base in some shop rags, leaving 
> just the top of the post exposed, then used a cut-off wheel in my 
> Dremel to make a deep scratch in the steel ball's seat on the top of 
> the post.
>
> I put it all back together, tested that the pumps made 60psi, 
> regulated it back down to 50, then watched the pressure bleed off in 
> about 5 seconds after I switched the pumps off.  Then I went in the 
> house to recover from the gas fumes.
>
> This method doesn't add any weight, connections or extra hose, but is 
> 100% effective at relieving the fuel line pressure on shutdown.
>
BTW, what made me decide to do this was some reading I was doing on the 
forums.  The chamber in the base that holds the pressurized fuel also 
has an 1/8"NPT outlet meant for a fuel pressure gauge.  I was 
considering using this for the pressure bleed connection.  Some of the 
hot-rodders were complaining about how the Aeromotive regulators weren't 
holding pressure after the fuel pumps were shut down.  They traced their 
woes to poor machining of the steel ball's seat on the base's post.

Their spending time and energy to clean up the machining to make a 
perfect seal, so I went out and destroyed some beautiful machine work to 
make a terrible seal.  Go figure.


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    On 08/15/2011 01:27 AM, Ernest Christley wrote:
    <blockquote cite="mid:list-5092112@logan.com" type="cite">
      <meta content="text/html; charset=ISO-8859-1"
        http-equiv="Content-Type">
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      <br>
      I removed the 4 screws, wrapped up the base in some shop rags,
      leaving just the top of the post exposed, then used a cut-off
      wheel in my Dremel to make a deep scratch in the steel ball's seat
      on the top of the post.<br>
      <br>
      I put it all back together, tested that the pumps made 60psi,
      regulated it back down to 50, then watched the pressure bleed off
      in about 5 seconds after I switched the pumps off.&nbsp; Then I went in
      the house to recover from the gas fumes.<br>
      <br>
      This method doesn't add any weight, connections or extra hose, but
      is 100% effective at relieving the fuel line pressure on shutdown.<br>
      <br>
    </blockquote>
    BTW, what made me decide to do this was some reading I was doing on
    the forums.&nbsp; The chamber in the base that holds the pressurized fuel
    also has an 1/8"NPT outlet meant for a fuel pressure gauge.&nbsp; I was
    considering using this for the pressure bleed connection.&nbsp; Some of
    the hot-rodders were complaining about how the Aeromotive regulators
    weren't holding pressure after the fuel pumps were shut down.&nbsp; They
    traced their woes to poor machining of the steel ball's seat on the
    base's post.<br>
    <br>
    Their spending time and energy to clean up the machining to make a
    perfect seal, so I went out and destroyed some beautiful machine
    work to make a terrible seal.&nbsp; Go figure.<br>
    <br>
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