Jeff_S Posted October 5, 2014 Report Posted October 5, 2014 For those folks with a G1000 setup, here's a question for you. It seems that my sight fuel gauges on the wing and the G1000 fuel gauges aren't matching up that well. The sight gauges are registering a more conservative opinion (e.g. lower levels) than the electronic gauges. Anybody have experience calibrating those so they are more in alignment? Quote
Danb Posted October 5, 2014 Report Posted October 5, 2014 Yes, the I believe the sight gauges are correct, mine were ok until I went to long range tanks then the G 1000 was calibrated for the reg 89 gal tanks, also my fuel totalizer records about 1.5 gal high which I'm not going to adjust the extra margin is an extra reserve.. Quote
jfdez Posted October 5, 2014 Report Posted October 5, 2014 Remember that the sight gauges are designed to be accurate when the plane is on the ground not in the sir. On the ground the plane, sits about 3-5 degrees nose high. Quote
Robert C. Posted October 5, 2014 Report Posted October 5, 2014 Dan and jfdez raise the 2 points I was going to raise. It does get me thinking though....does my totalizer match the G1000 fuel gauges? My recollection is that they don't, I.e. The fuel gauges inside and outside both go to 89 gal and not to 102 gal. So it isn't till I've burned 13 or so gal that things start to agree. Will have to check that more carefully Next time I go flying. Of course the right wing fuel sight gauge popped and disappeared in the past few weeks so I'll have to wait for a new one before I can complete the excercise. Robert Quote
Piloto Posted October 6, 2014 Report Posted October 6, 2014 The wing sight gauges only show the fuel in the inboard section of the tank. While the panel gauges show the fuel in the inboard and outboard sections of the tank. The panel gauges are connected to an inboard and outboard float senders that add the two fuel quantities. Below ten gallons on each side the sight gauges will indicate a lower fuel level than what is actually in the tank. Also they will not indicate the extra fuel onboard past the 30 gallon mark. This due to the location of the sight gauge. José Quote
Jeff_S Posted October 6, 2014 Author Report Posted October 6, 2014 Thanks all for your thoughts. On my plane, the sight fuel gauges will definitely show the fuel past 30 gallons, but it doesn't have any calibrations beyond that so you're guessing a bit. But as it stands right now, the sight gauges both show 25 gallons and yet the G1000 gauges are showing more like 30. I need to keep testing it to get some empirical data. I do know that the sight gauges are supposed to be accurate only on the ground. And of course the POH says the G1000 gauges are only guaranteed accurate when empty...how do they get away with that in this day and age!? Oh well, it's always something with an airplane...even one with all the latest fancy gewgaws. (Perhaps ESPECIALLY one with all the fancy gewgaws.) Quote
carusoam Posted October 6, 2014 Report Posted October 6, 2014 They get away with it because... What people need is not deliverable by the plane manufacturer in an economic method. Fortunately, MS pilots are capable of the last step that makes flying comfortable... The calibrated FF gauge with it's fuel used (summation) is the method most people are using for accuracy. But it requires knowing how much fuel was put in. Full up, is still a challenge for some Mooneys. Every new owner has to go through the effort of emptying the tanks, then filling the tanks to the 'top' zero out the electronic FF sensor system and do it again. The new owner learns: - how the four fuel level sensors work - what K factor means - what full is - what usable is Complex, but doable... Best regards, -a- Quote
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