air.guerner(at)orange.fr
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 Posted: Fri May 08, 2009 3:15 am Post subject: Fuel return line attachment point with 912UL |
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I am just returning from a wonderfull two week vacation in Florida. It was a pleasure to meet with all Europaers at SnF.
That is why I am so late to add my contribution to this thread.
After installation of my 912S engine back in 2005, I made some measurements of the return flow using a stopwatch and a calibrated plastic can receiving the returned fuel. This was done on the ground with the engine stopped and the electric pump on. This is what I found:
- with the .7 millimeter restrictor supplied by Europa: 12 liters/hour with fuel pressure 4 PSI
- with a .35 millimeter restrictor as specified by Rotax: 3,5 liters/hour with fuel pressure 4,8 PSI
From my records, the following in flight fuel pressures (with the electric fuel pump off) were measured:
- with the .7 millimeter restrictor, cruising at 7500 ft: 3 PSI
- with the .35 millimeter restrictor, cruising at 2000-3000 ft: 3,2 to 3,8 PSI
- with the .35 millimeter restrictor, cruising at 11500-12000 ft: 3,5 PSI
Due to the lower fuel pressures recorded in flight, I assume the return flow is lower than what I measured on the ground.
This seems to be consistent with what Svein measured below.
Hope that helps.
Regards
Remi Guerner
F-PGKL
<<<<If you use the standard Europa supplied restrictor in the fuel return line
from 912S, the return flow is an amazingly high 10 liters (approx) / a
little less than 3 USG per hour even with full fuel tank pressure head on
the return line. >>>>>>
[quote][b]
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