Mandatory SB565 Lycoming fuel pump

Yes, after I got some altitude, I did switch tanks to see if the problem
was associated with a particular tank, but the fuel pressure was fine on
both the inboard and outboard tank.

The big vents can be sealed with a small cork or rubber stopper with a
long red "REMOVE BEFORE FLIGHT" ribbon attached. Just push
them into the hole. I've not tried to seal the small vent lines.

The big vent opening is where the bug did his job in my case. That
tube leads up to a cylinder where the small tube is attached. In our
case, the blockage was in the large tube, althought you're correct in
that a tiny bug could also crawl up the tiny vent tube and get into the
vent system.


"Frank Ch. Eigler" wrote in message
...

"nobody" writes:

[...] Sure enough, my mechanic and I found the left outboard tuel
tank vent tubing was almost completely plugged, way up inside, about
halfway between the vent port and the tank. [...] This is a good
argument for capping the fuel vent ports when the airplane is
parked, just like we cap the pitot tube. [...]

How would you do that with an Aztec? Each fuel tank's vents open on
the underside of wing, one exiting in a big hole in this ceramic-like
block, and a second little vent tube to drain liquids from the big
one. Both point mostly down (and there are eight of them total).

- FChE