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Actual fuel quantity [message #11631] Mon, 28 July 2014 17:05 Go to next message
TjYak50
Messages: 280
Registered: April 2011
Location: Phoenix, AZ (KDVT)
Senior Member
What is everyones actual past experience with the following?

* 15G Outer Tanks... I only ever seem to get 12 or 13 in them.
* Main tank capacity... By reference to cockpit gauge I get a little more than 154
* Foxboro accuracy? And is there an adjustment tweak for it?

Tj


Tom Johnson
Aviation Insurance Broker / Mu2 Owner-was
Assured Partners Aerospace (Phoenix)
Tj@airpowerinsurance.com
Actual fuel quantity [message #11632] Mon, 28 July 2014 17:10 Go to previous messageGo to next message
Anonymous is currently offline  Anonymous
Messages: 6600
Registered: August 2015
Senior Member
Hi .

I am with the understanding that the Foxboro is very accurate with only a small error margin in your favor

David Slivka
Anaconda Aviation in USA
Work: 561-241-6111
Fax: 561-241-6117
Email: anacondads@aol.com
Web site: http://www.anacondaaviation.com
Re: Actual fuel quantity [message #11633] Mon, 28 July 2014 17:17 Go to previous messageGo to next message
TjYak50
Messages: 280
Registered: April 2011
Location: Phoenix, AZ (KDVT)
Senior Member
Anacondads--- via Mu2list
Hi .

I am with the understanding that the Foxboro is very accurate with only a small error margin in your favor


That matches with what I've seen so far.


Tom Johnson
Aviation Insurance Broker / Mu2 Owner-was
Assured Partners Aerospace (Phoenix)
Tj@airpowerinsurance.com
Actual fuel quantity [message #11634] Mon, 28 July 2014 17:17 Go to previous messageGo to next message
Anthony Wolf
Messages: 86
Registered: July 2013
Location: Durango, CO
Member
I have recently noted that more fuel can be gotten into the mains after the tips and outers are full - perhaps an even keel kind of issue. I also usually have the line fueler double check all main and outer levels. Usually get another 5-10 gallons in.

Have found Foxboro totalizer +-2 gallons with fuel truck. When variance is greater (Fox > truck) I suggest that all inner and main tank levels be rechecked.



Anthony F. "Tony" Wolf, CTP
Managing Director
Safe Harbor Associates
817-821-7335
anthonyfwolf@me.com (anthonyfwolf@me.com)
Actual fuel quantity [message #11635] Mon, 28 July 2014 17:28 Go to previous messageGo to next message
Dennis Wolf
Messages: 179
Registered: April 2011
Senior Member
Sometimes the others don't empty completely. Happened to me a few times.
Actual fuel quantity [message #11636] Mon, 28 July 2014 17:35 Go to previous messageGo to next message
Anonymous is currently offline  Anonymous
Messages: 6600
Registered: August 2015
Senior Member
I've seen the same on the outers on the 15gal variety, my 35 gal outers seem to drain fully.
Always had very good accuracy on the foxboro.
Actual fuel quantity [message #11637] Mon, 28 July 2014 17:42 Go to previous messageGo to next message
Dave Klain is currently offline  Dave Klain
Messages: 1156
Registered: April 2011
Location: Fairfax, VA
Senior Member
Administrator
I’ve found my 35 gal outers to hold about what they should and that the fuel totalizer is scary in how accurate it is.  I do find that if they fill the main tank with one hose, they will fill one side until full, then fill the other but that if they don’t wait a bit (or check the first side again) they may not get the full amount in (presumably as the fuel is settling and leveling off between the three compartments in the main fuel tank.  That said, it is never more than 5-10 gal they can get in so unless I am really worried about max fuel, I don’t sweat it because my general rule of thumb is to land with at least 600 lbs of fuel on board.  I do look at the main fuel tank gauge and see what it reads on power up and have a feel for what “full” looks like on the gauge (on all three gauges actually).

Dave

From: Mu2list [mailto:mu2list-bounces@mailman.mu-2aopa.com] [b]


MU-2 AOPA administrator
Actual fuel quantity [message #11638] Mon, 28 July 2014 18:16 Go to previous messageGo to next message
Scott Dann
Messages: 328
Registered: April 2011
Senior Member
Tom and others,
My experience is identical: 12-13 out of outers, 155 or a bit more out of mains and my Foxboro is scarey accurate.
Scott Dann


From: "Johnson, Tom" <tomjohnson@cox.net>
To: mu2list@mailman.mu-2aopa.com
Sent: Monday, July 28, 2014 4:05:49 PM
Subject: [MU-2 list] Actual fuel quantity


What is everyones actual past experience with the following?

* 15G Outer Tanks... I only ever seem to get 12 or 13 in them.
* Main tank capacity... By reference to cockpit gauge I get a little more than 154
* Foxboro accuracy? And is there an adjustment tweak for it?

Tj




Tom Johnson
Aviation Insurance Broker / Mu2 Owner (349SA)
Airpower Insurance, LLC
www.airpowerinsurance.com
Actual fuel quantity [message #11643] Tue, 29 July 2014 12:52 Go to previous messageGo to next message
TjYak50
Messages: 280
Registered: April 2011
Location: Phoenix, AZ (KDVT)
Senior Member
Thanks for all the good replies.

We have new fuel reconciliation scheme so all 3 operators can fairly account for fuel used which is surprisingly complex.

My gut tells me the Main can hold a little more than advertised, the Outers a little less and the tips about spot-on.

Tj


Tom Johnson
Aviation Insurance Broker / Mu2 Owner-was
Assured Partners Aerospace (Phoenix)
Tj@airpowerinsurance.com
Actual fuel quantity [message #11644] Tue, 29 July 2014 12:54 Go to previous messageGo to next message
Dave Klain is currently offline  Dave Klain
Messages: 1156
Registered: April 2011
Location: Fairfax, VA
Senior Member
Administrator
Why not just go with the amount used based on the fuel totalizer? That way what tank(s) the fuel came from or went into is irrelevant. Fuel usage is fuel usage based on totalizer...
Dave


MU-2 AOPA administrator
Actual fuel quantity [message #11645] Tue, 29 July 2014 13:05 Go to previous messageGo to next message
TjYak50
Messages: 280
Registered: April 2011
Location: Phoenix, AZ (KDVT)
Senior Member
Well... math is an issue sometimes. One error gets compounded and it alwasy seems to be in the wrong direction. We have been datalogging fuel for the last month in multiple ways to see what is most accurate. By math, totalizer, and gauge observation.

We have 3 operators and one fuel farm account. Effectively we consider the fuel in the tanks = fuel in the ground. Its all just inventory. An operator could return the plane with more or less than he left and his individual fuel allocation could go down or up based on this. We don't refuel after every flight just so the next operator has a chance to choose his own fuel load.

After a few more flights we will have a good read on the respective accuracy for our accounting and I will report back.

TJ


Tom Johnson
Aviation Insurance Broker / Mu2 Owner-was
Assured Partners Aerospace (Phoenix)
Tj@airpowerinsurance.com
Actual fuel quantity [message #11646] Tue, 29 July 2014 13:11 Go to previous message
Dave Klain is currently offline  Dave Klain
Messages: 1156
Registered: April 2011
Location: Fairfax, VA
Senior Member
Administrator
Sounds like fun...Glad I don't have to deal with it.

MU-2 AOPA administrator
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