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To:  lml@lancaironline.net
Date: Tue, 24 May 2011 13:23:21 -0400
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Subject: Fuel restriction or air part 2
From: Berni <bbreen@cableone.net>
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First of all...thanks to everyone that has tried to help me with my engine s=
urge (fuel related) problem on my normally aspirated Lancair IV.  I have thr=
oughly checked and tested everything suggested so far.  There are no tank ve=
nt issues and a vacuum test of the entire system from the engine driven fuel=
 pump back to the tanks proved there is no air getting into the system.  I e=
ven replaced the o rings on the inlet and outlet sides of the electric fuel p=
ump just to be sure.  Unfortunately my test flight this morning confirmed th=
at the issue still remains.

This is what happened.  On a 50 mile cross country where I took off and clim=
bed to 7,500 I experienced zero issues.  I landed took on some fuel and took=
 off for home.  I climbed to 7,500 again and saw that the fuel flow and fuel=
 pressure gauges were fluctuating.  Since this occurrence preferred my engin=
e surge problem in the past I knew it was coming and it did.  The engine beg=
an surging and continued to do so until I turned on the electric ( back up) f=
uel pump.  The engine and gauge readings stabilized immediately.

So this is where I am...I know I do not have any vacuum (air) leaks from the=
 tanks through to the engine driven pump, nor do I have any restrictions in t=
he fuel lines or fuel tank vents.  I have replaced my engine driven pump.  A=
ll symptoms remain.

Question...if I am at cruise settings and leaned out reading 16GPH on the fu=
el flow and 10PSI on the fuel pressure should this readings rise when I turn=
 the electric fuel pump on?  My GPH goes from 16 to 21 and my fuel pressure g=
oes from 10 to 15 or higher.

Sent from my iPad
Berni Breen
Bbreen@cableone.net=