----- Original Message -----
Sent: Friday, February 11, 2005 2:51
PM
Subject: [FlyRotary] Re: More wild
ideas was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts
One final thought.....my aluminum sump tank
in not vented. Seems we discussed this at length when I was building this
thing, and since the overflow is pumped into the sump tank, the fuel might
just be pumped right out of the vent.
Paul, this sounds a LOT like a problem I've
experienced.
My returns go to the main tanks switched
by a solenoid. I used to be able to create
a crossfeed situation where I was drawing from one tank, but
returning to the other. The tank receiving the return became full, and I
lost power down to 2500 rpm or so. I was in the pattern when this
occurred, so I just brought it home. I had fuel coming out of the vent.
I've seen this twice when trying to feed the return to a full tank. Maybe
the fuel pressure drops under these circumstances.
In my case I've rewired the switches to
avoid crossfeed and added a crossfeed warning light.
Regards,
John
Hi, John....No fun pumping
perfectly good fuel overboard. In my system, the unused fuel is pumped
back into the aluminum sump tank. If the sump tank is already full, then
less fuel would be drawn from the main tank, (I presume), or it would
slowly just push the fuel into the sump tank and back up the main supply
line back into the selected tank. ( I have an Andair fuel tank selector,
and can select left, right or both). Of course this system only has
approximately 9.5 flight hours and maybe 10 initial ground/taxi hours, so
it is not entirely proven, of course. I shamelessly copied Ed
Anderson's aluminum sump tank, with the exception that my tank is slightly
larger, and is located on the cool side of the firewall instead of the
engine side of the firewall like Ed's. Paul Conner
No virus found in this incoming message.
Checked by AVG
Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.7 - Release Date:
2/10/2005