Aux Fuel Pump Flow Oddities

[kreutzberg]

I've been enjoying this excellent aircraft. As I understand it, a lot of the leaning is done to the specific fuel flows described in the manual, which I've been trying to master. I recently ran into an interesting oddity regarding fuel flows and the aux pumps.

At sea level, putting the pumps on low increases fuel flow, which makes sense. While climbing with one on and one off, starting about 4000 feet, the fuel flows start to converge. By about 6000 feet, setting the pumps to low does not change fuel flow (putting them on high does change fuel flow). However, when I descend in the same configuration, the fuel flows stay constant with one pump on and one off. And when starting at a 5000 foot airport (KPRC, FWIW), I see no difference in fuel flows.

Initially, I thought it was an altitude effect, but it seems a little erratic for that. It's possible there is a nuance to how these systems work that I'm not aware of, but I suspect a bug. Thanks!

[Slayer]

I know fuel flows were being looked at for the service release. Hopefully that will be out soon.

[kreutzberg]

Thanks. Is there any more information about this upcoming update? I'm curious what else might change!

[Slayer]

Thanks. Is there any more information about this upcoming update? I'm curious what else might change!

Check the announcement at the top of the forum the link is there for the new version. It is not a wide release yet as we want to make sure there are no showstoppers first before it gets sent to everyone.

[kreutzberg]

Thanks!