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Date: Tue, 15 May 2007 21:16:49 -0400
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From: Charlie Kohler <charliekohler@yahoo.com>
Subject: Re: [LML] Re: Continental Engine fuel Sys.
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Hi Eugene,
I went back and reread your initial post and I feel you were correctly analyzing the problem.
There is a remote possibility that the vent system is at fault--however it is hard to believe that both tank vents would be plugged at the same time. 
If you remove your fuel cap and put a rubber line into the naca vent and blow on it--you should feel air coming out the fuel cap. If not-you probably have a flex line kinked. If you've been flying a while without problems than it's not likely that the vents are too small. 
If all is good here--you have to believe something is wrong with the fuel system. That consists of three components. Engine-driven fuel pump/fuel control (throttle valve)/fuel manifold valve.
To have to use the electric fuel pump to keep the engine running below 10,000 feet is indication of a problem and I would not fly the airplane until I found the problem. You are using your emergency backup system in a normal operation.
You don't say how many hours or years on the engine. But if these fuel system components have over five years I would consider them due especially with the problems you are having.
Charlie K. 

.


----- Original Message ----
From: "marv@lancair.net" <marv@lancair.net>
To: lml@lancaironline.net
Sent: Tuesday, May 15, 2007 12:06:18 PM
Subject: [LML] Re: Continental Engine fuel Sys.


Posted for "glong2" <glong2@netzero.net>:

Charlie:

I did the check yesterday. I drained about 1/5 quarts through the sniffle
valve and did not get a drop from the manifold valve drain. I was surprised
how fast the high boost pump put gas in the manifold to the sniffle valve. I
am still looking for a better explanation than I have!

Have you ever seen a bad manifold valve diaphragm be intermittent?

This is all good troubleshooting information, thanks for your input.

Eugene Long
Lancair Super ES

"""
Actually-- It's a good hangar "floor" preflight check. There are two
drains-usually on left side by the nose gear door (sniffle valve on the
right).
One, ( the engine driven fuel pump) may drain oil or fuel-- depending which
seal is leaking. Fuel is especially bad as it is a precurser to fuel leaking
by the oil seal and filling the crankcase.

The other drain is the one in the previous post. The fuel manifold drain.
Another bad (grounding) sign.

A blue stain on the belly or a spot on the hangar floor is a sign.

By the way-- a black (oil) spot on ground under sniffle valve on hangar
floor is a indicator that intake valve guides are worn. If you pull an
intake pipe, you'll find oil inside. Time to think about a top o'haul. 
"""


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<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:garamond, new york, times, serif;font-size:12pt"><DIV></DIV>
<DIV><FONT size=2>
<P>Hi Eugene,</P>
<P>I went back and reread your initial post and I feel you were correctly analyzing the problem.</P>
<P>There is a remote possibility that the vent system is at fault--however it is hard to believe that both tank vents would be plugged at the same time. </P>
<P>If you remove your fuel cap and put a rubber line into the naca vent and blow on it--you should feel air coming out the fuel cap. If not-you probably have a flex line kinked. If you've been flying a while without problems than it's not likely that the vents are too small. </P>
<P>If all is good here--you have to believe something is wrong with the fuel system. That consists of three components. Engine-driven fuel pump/fuel control (throttle valve)/fuel manifold valve.</P>
<P>To have to use the electric fuel pump to keep the engine running below 10,000 feet is indication of a problem and I would not fly the airplane until I found the problem. You are using your emergency backup system in a normal operation.</P>
<P>You don't say how many hours or years on the engine. But if these fuel system components have over five years I would consider them due especially with the problems you are having.</P>
<P>Charlie K. </P></FONT><BR>.</DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: garamond, new york, times, serif"><BR><BR>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">----- Original Message ----<BR>From: "marv@lancair.net" &lt;marv@lancair.net&gt;<BR>To: lml@lancaironline.net<BR>Sent: Tuesday, May 15, 2007 12:06:18 PM<BR>Subject: [LML] Re: Continental Engine fuel Sys.<BR><BR>
<DIV id=_htmlarea_default_style_ style="FONT: 10pt arial, helvetica, sans-serif">Posted for "glong2" &lt;glong2@netzero.net&gt;:<BR><BR>Charlie:<BR><BR>I did the check yesterday. I drained about 1/5 quarts through the sniffle<BR>valve and did not get a drop from the manifold valve drain. I was surprised<BR>how fast the high boost pump put gas in the manifold to the sniffle valve. I<BR>am still looking for a better explanation than I have!<BR><BR>Have you ever seen a bad manifold valve diaphragm be intermittent?<BR><BR>This is all good troubleshooting information, thanks for your input.<BR><BR>Eugene Long<BR>Lancair Super ES<BR><BR>"""<BR>Actually-- It's a good hangar "floor" preflight check. There are two<BR>drains-usually on left side by the nose gear door (sniffle valve on the<BR>right).<BR>One, ( the engine driven fuel pump) may drain oil or fuel-- depending which<BR>seal is leaking. Fuel is especially bad as it is a precurser to fuel leaking<BR>by the oil seal and
 filling the crankcase.<BR><BR>The other drain is the one in the previous post. The fuel manifold drain.<BR>Another bad (grounding) sign.<BR><BR>A blue stain on the belly or a spot on the hangar floor is a sign.<BR><BR>By the way-- a black (oil) spot on ground under sniffle valve on hangar<BR>floor is a indicator that intake valve guides are worn. If you pull an<BR>intake pipe, you'll find oil inside. Time to think about a top o'haul. <BR>"""<BR><BR></DIV>
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