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  #21  
Old 03-06-2018, 07:03 PM
billieracing billieracing is offline
 
Join Date: Sep 2015
Location: Grand Rapids Michigan
Posts: 8
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I completed my fuel flow calibrations, float level calibrations, and checked unusable fuel this past Saturday. Very happy with 26 GPH on the electric pump. 2oz of fuel left per tank or less, there was so little the pump could not pump its not even worth mentioning.
If anyone is a gallon or more of unusable fuel there is an issue, assuming the pickup tube is not on the bottom inside of the tank????
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Billie Racing
RV-9A, started 2015, finished ?
The blood that squirts from your finger after you run a #40 drill bit into it is proof that your still alive.
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  #22  
Old 03-07-2018, 05:32 AM
bobnoffs bobnoffs is offline
 
Join Date: Jul 2012
Location: n. wi
Posts: 499
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it was earlier mentioned that weight measurement is the most accurate. that may be true but not helpful here. your system leaves fuel behind by volume, not weight.your unusable may be 6lbs on a cold day and 5lbs 14oz on a hot day.
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  #23  
Old 03-07-2018, 08:33 AM
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airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 4,116
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Quote:
Originally Posted by bobnoffs View Post
it was earlier mentioned that weight measurement is the most accurate. that may be true but not helpful here. your system leaves fuel behind by volume, not weight.your unusable may be 6lbs on a cold day and 5lbs 14oz on a hot day.
Either way that's still too much - almost all RV's have an unusable in the 1-2 digit ounces (by weight OR volume) range. Gallons is not an acceptable unit of measure in this case, something else is hokey.
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Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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  #24  
Old 03-07-2018, 08:39 AM
219PB 219PB is offline
 
Join Date: Aug 2014
Location: Victoria, Tx
Posts: 254
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I agree with a previous post. I would not make the first flight until I fully understood the discrepancy. The downside is too great.
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  #25  
Old 03-10-2018, 02:48 PM
KatanaPilot KatanaPilot is offline
 
Join Date: Feb 2015
Location: Locust Grove, GA
Posts: 351
Default Problem Solved

Today I pumped out all of the fuel using the electric fuel pump, then pulled the sump drains. Although the fuel remaining was not a couple of ounces, the total unusable fuel for my airplane with a flop tube is less than 0.25 gallons. While the right side pickup in the QB tank may be a little higher than desired, I find this result perfectly acceptable.

The problem clearly was twofold - the meter on the portable fuel tank was inaccurate and the "full" mark on the 5 gallon can I used to measure the fuel pumped out is also way off. So the fuel "in" and "out" were not measured properly. But the unusable fuel is within a reasonable range.
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