pa38112
Well Known Member
I am getting ready to run down an issue with my fuel flow reading jumping around, but want to verify that this is not a normal condition first.
I have a carbureted O-360-A1A. Fuel flow is measured with a red cube and an MGL FF-1 fuel computer.
At any given power or lean setting fuel flow reading fluctuates every second or so by as much as 1.2gph. I have always assumed this was because the carburetor float seats and unseats causing the flow to the carburetor bowl to fluctuate, but I have never heard anyone else mention difficulty in doing a GAMI test or setting a specific fuel flow on their carbureted engine. Am I the only one with this problem?
The first thing I want to do is verify the sensor stability. I plan on doing this by disconnecting the fuel line and pressurizing the wing tank to 25" water so that there is a very consistent flow of fuel through the red cube and into a fuel can. With a steady regulated 25" pressure the entire fuel tank should flow at a very steady rate.
If the sensor is stable then I will move to replacing the float, needle valve, and seat. That is a little expensive, so please let me know if this condition is an issue or is normal...
I have a carbureted O-360-A1A. Fuel flow is measured with a red cube and an MGL FF-1 fuel computer.
At any given power or lean setting fuel flow reading fluctuates every second or so by as much as 1.2gph. I have always assumed this was because the carburetor float seats and unseats causing the flow to the carburetor bowl to fluctuate, but I have never heard anyone else mention difficulty in doing a GAMI test or setting a specific fuel flow on their carbureted engine. Am I the only one with this problem?
The first thing I want to do is verify the sensor stability. I plan on doing this by disconnecting the fuel line and pressurizing the wing tank to 25" water so that there is a very consistent flow of fuel through the red cube and into a fuel can. With a steady regulated 25" pressure the entire fuel tank should flow at a very steady rate.
If the sensor is stable then I will move to replacing the float, needle valve, and seat. That is a little expensive, so please let me know if this condition is an issue or is normal...