N941WR
Legacy Member
With over 60 flown in my -9 in the past month and a half I have experienced one in flight engine stoppage and two while rolling out after landing.
All three events happened after prolonged flights at low power or idle with the boost pump and carb heat on while burning 100LL. Such as following three J-3's into an airport for a fly-in. Never did the engine even sputter during normal operations.
My setup is per the plans, other than the installation of the fuel flow meter with the boost pump is on the cabin side of the firewall.
After much thought and investigation, I believe the cause was possible vapor lock in the un-insinuated 180 degree loop I put in the fuel line between the gascolator and the fuel flow meter. Click on this picture:
The fuel line was insulated three days ago but have not test flown the airplane yet. Once I test fly it, I will post my results here and on my web site.
The purpose of this post is to get the message out and to see if anyone else has had a problem with a similar installation.
I suspect this might be unique to my small engine sipping fuel at idle but I can’t say for sure.
(I know there are other places to put this meter but that is not the purpose of this thread, so please do not contribute to thread drift as this is an important safety issue. - Thanks.)
Search words: fuel flow meter line gascolator location service bulletin
All three events happened after prolonged flights at low power or idle with the boost pump and carb heat on while burning 100LL. Such as following three J-3's into an airport for a fly-in. Never did the engine even sputter during normal operations.
My setup is per the plans, other than the installation of the fuel flow meter with the boost pump is on the cabin side of the firewall.
After much thought and investigation, I believe the cause was possible vapor lock in the un-insinuated 180 degree loop I put in the fuel line between the gascolator and the fuel flow meter. Click on this picture:
The fuel line was insulated three days ago but have not test flown the airplane yet. Once I test fly it, I will post my results here and on my web site.
The purpose of this post is to get the message out and to see if anyone else has had a problem with a similar installation.
I suspect this might be unique to my small engine sipping fuel at idle but I can’t say for sure.
(I know there are other places to put this meter but that is not the purpose of this thread, so please do not contribute to thread drift as this is an important safety issue. - Thanks.)
Search words: fuel flow meter line gascolator location service bulletin
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