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Old 03-03-2023, 07:49 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,875

The carburetor float bowl (especially on Rotax 9-series) is a very violent place. The carbs are located at the extreme from engine centerline and are thus subject to large fluctuations in vibration. Couple that with turbulence in flight and you can visualize fuel slushing every direction within the float bowl. Difficult to control fuel level….

Best practice is to use lightest floats in conjunction with clean needle and seat – both with minimal wear. Use magnification with good lighting to inspect needle and seat. Also check and verify fuel level is correct height in bowl per spec. In addition, check float pivot hardware for wear and replace if necessary…
Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 830

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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Old 03-04-2023, 09:40 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,372

Totally different setup, but I put a normal and emergency fuel pump on my first home built (a WAR FW-190). I had both operating during takeoff. The engine ran rough, and I had to use lean mixture during takeoff to smooth it out until I finally figured it out. The engine was happy with the pressure of gravity feed from the tank mounted only a foot above the carburetor.
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