----- Original Message -----

Sent: Friday, February 11, 2005 = 2:51=20 PM

Subject: [FlyRotary] Re: More = wild ideas=20 was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts

One final thought.....my aluminum = sump tank in=20 not vented. Seems we discussed this at length when I was building this = thing,=20 and since the overflow is pumped into the sump tank, the fuel might = just be=20 pumped right out of the vent.

Paul, this sounds a LOT like a = problem I've=20 experienced.

My=20 returns go to the main tanks switched by a solenoid. I used to be = able to=20 create a crossfeed situation where I was drawing from one = tank, but=20 returning to the other. The tank receiving the return became full, and = I lost=20 power down to 2500 rpm or so. I was in the pattern when this occurred, = so I=20 just brought it home. I had fuel coming out of the vent. I've seen = this twice=20 when trying to feed the return to a full tank. Maybe the fuel pressure = drops=20 under these circumstances.

In=20 my case I've rewired the switches to avoid crossfeed and added a=20 crossfeed warning light.

Regards,

John

Hi, John....No fun = pumping=20 perfectly good fuel overboard. In my system, the unused fuel is pumped = back=20 into the aluminum sump tank. If the sump tank is already full, then = less fuel=20 would be drawn from the main tank, (I presume), or it would slowly = just push=20 the fuel into the sump tank and back up the main supply line back into = the=20 selected tank. ( I have an Andair fuel tank selector, and can select = left,=20 right or both). Of course this system only has approximately 9.5 = flight hours=20 and maybe 10 initial ground/taxi hours, so it is not entirely proven, = of=20 course. I shamelessly copied Ed Anderson's aluminum sump tank, = with the=20 exception that my tank is slightly larger, and is located on the cool = side of=20 the firewall instead of the engine side of the firewall like = Ed's. Paul=20 Conner

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