Ed H wrote:

"Dylan Smith" wrote in message
...
A couple of points with regard to running out of fuel:


Question for all: how accurate are fuel flow meters?

I have a JPI EDM-800 engine monitor installed in my Bonanza and its fuel
flow meter is accurate to less than 1 gallon per three hour flight. The
JPI reads one gallon less than there really is in the tanks after a three
hour flight. The JPI also has a programmable alarm that will flash time
remaining when time reaches a preset limit. I set it to one hour
remaining., which is the upper limit of the alarm.

Regarding accuracy, there is a method for adjusting the k-factor in this
instrument that would allow me to get the fuel flow even more accurate, but
I have yet to do this.

Another nice feature of the JPI is that it feeds fuel flow and fuel
remaining data to the Garmin GNS430. This allows me to go to the Fuel
Planning page of the GPS to see an actual landing fuel, fuel to next
waypoint, fuel needed for remaining trip, and time remaining (endurance).

Of course, the GIGO factor applies here (garbage in, garbage out). The JPI
needs to be told how much fuel is on board. If the pilot fails to
initialize the instrument with the actual FOB, the fuel remaining and
endurance will obviously be incorrect.

--
Peter


















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