Thanks Sam, Interesting report. Makes me glad I fitted a second pump when I read it. Got any findings yet ?

Do you use a raster map on your Dynon, what Nav data do you use ? Pocket FMS ?

Rich T.

On 07/11/2021 20:38, Sam Hoskins wrote:

I made a little trip to Topeka this weekend to see the grands. Nice time was had by all. Non-eventful weather and the winds were okay in both directions, but sometimes I do wish I had cabin heat.  As long as the sun is shining in lower temps, I'm good. My old Dynon is showing everything in the green.

My route of flight takes me just over the lower end of Whiteman AFB, which is the Air Force's main B-2 bomber base.  Sometimes I'll see a billion dollar bomber on the ramp, like today.  The top of the control zone is 3,500 feet and I was heading east at 5,500. It always seems a bit strange to fly over Whiteman, feels like maybe I'm being watched?

As you may know I have an electric fuel injection system and have two Walbro pumps to deliver fuel at 40 psi. When I fly West, I'm on pump #1 and East I use pump #2. Both pumps are on for takeoff and landing phases. About an hour from home I noticed my mixture getting very lean.  As I was fooling with the mixture I suddenly got a LOW FUEL PRESSURE warning. I flipped on pump #1 and things went back to normal. Not believing what I was seeing I tried turning #1 off, and the engine just about died.  

Okay, I get the hint. Turn #1 back on and #2 off, just in case it is spewing parts. Rest of the flight was uneventful and I didn't touch a thing until I got on the ground. Looks like I'll be ordering a new pump and a new 10 micron fuel filter.

All in all a fun day.

Sam