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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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