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Subject: Re: [FlyRotary] Re: Intermittent fuel pressure loss
References: <list-6292388@logan.com>
From: Tracy <rwstracy@gmail.com>
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Date: Mon, 27 May 2013 19:47:33 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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I understand the reluctance to back off the throttle when there isn't a land=
ing spot handy but keep in mind that most homebuilts will maintain altitude o=
n way less than even an economy cruise setting.   I typically cruise between=
 6.5 and 7.5 GPH but the plane will maintain altitude ( at a lower airspeed)=
 on only 3.5 GPH.  Trying less throttle should be among the first things to t=
ry when the engine acts up.

Tracy

Sent from my iPad

On May 27, 2013, at 16:04, "Bill Bradburry" <bbradburry@bellsouth.net> wrote=
:

> I never considered the throttle.  I was at 2000 feet over a forest!  I gue=
ss
> my wife will have to throw my drawers away..  :>)
>=20
> B2
>=20
> -----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
>=20
> I had almost the exact same experience on two occasions.  First time it wa=
s
> 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 th=
e
> screen.
>=20
> Second time it was a clogged pre pump filter.   Did not try second pump bu=
t
> found that if I backed off the throttle engine recovered.   Less power =3D=

> 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.
>=20
> Tracy
>=20
> Sent from my iPad
>=20
> On May 27, 2013, at 10:09, "Bill Bradburry" <bbradburry@bellsouth.net>
> wrote:
>=20
>> 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.
>>=20
>> 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.
>>=20
>> 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.
>>=20
>> 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.
>>=20
>> Any thoughts, suggestions, experiences? =20
>>=20
>> 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!
>>=20
>> Bill B
>>=20
>>=20
>> --
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>=20
> --
> Homepage:  http://www.flyrotary.com/
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>=20
>=20
> --
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