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From: "Bill Bradburry" <bbradburry@bellsouth.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
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Subject: RE: [FlyRotary] Re: Intermittent fuel pressure loss
Date: Mon, 27 May 2013 16:04:29 -0400
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I never considered the throttle.  I was at 2000 feet over a forest!  I guess
my wife will have to throw my drawers away..  :>)

B2

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Tracy
Sent: Monday, May 27, 2013 2:44 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Intermittent fuel pressure loss

I had almost the exact same experience on two occasions.  First time it was
a clogged gascolator.   Turning on the backup pump made enough pressure
across the filter disk in it to cause it to fold up and pass gas around the
screen.

Second time it was a clogged pre pump filter.   Did not try second pump but
found that if I backed off the throttle engine recovered.   Less power =
less fuel needed so fuel pressure recovered.   Did you try backing off the
throttle?   That has saved my butt on many occasions in many scenarios.

Tracy

Sent from my iPad

On May 27, 2013, at 10:09, "Bill Bradburry" <bbradburry@bellsouth.net>
wrote:

> Has anyone had an instance of intermittent failure of the fuel pumps?  A
> couple of days ago the engine started to intermittently lose power and
> changed tanks. (both tanks were low, about 5 gal in right and 10 or so in
> left)  The problem stopped so I thought I had unported the right tank.
> Several minutes later it started again on the left tank and I turned on
the
> other fuel pump.  That seemed to stop it again.  I still suspected that I
> had unported the tanks.
> 
> A couple of days later, I took off with about 45 gal and after about a 30
> min flight, the engine lost power again twice.  I turned the other fuel
pump
> on and the problem stopped.
> 
> My fuel system goes thru a Gascolator then to the two pumps, then to a
fuel
> filter.  I assume that the Gascolator or the fuel filter could be getting
> clogged, but I don't think that the other pump would bring the pressure
back
> if that were the case.  I only have about 70 flight hours on the pump and
> maybe about 100 hours total including ground runs.
> 
> Also on the flight back, I had both pumps on and showing 40 lbs of
pressure.
> I then turned the secondary pump off and the pressure held at 40 lbs.
This
> strikes me that it is an intermittent pump failure.  I plan to clean the
> Gascolator, replace the fuel filter, and replace the pump.
> 
> Any thoughts, suggestions, experiences?  
> 
> My wife was with me on the last incident and I don't think she is
interested
> in trying to join Ed's glider club!
> 
> Bill B
> 
> 
> --
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