I also removed my mechanical fuel pump and now have an electric fuel pump on my Jabiru powered Avid MK IV. I still have the stock 2.5 MM seat for the float needle. I've been meaning to put the 3.7 MM seat in but have yet to order it from Bing Carbs.
Facet Solid State Fuel Pump 12V, 1.5-4Psi, 12'/30.48Cm Min Dry Lift, 41501, 195-1310 Facet New Solid State Fuel Pump 12V 3-4.5Psi, 12' /30.48Cm Min Dry Lift 6558398 D72347 Bravex Inline Electric Fuel Pump Universal DC 12V Low Pressure 2.5-4 PSI Petrol Diesel (EP12S).
I use my electric fuel pump for full throttel operations, but have been told that if I put the 3.7 MM seat in, I will not need the fuel pump as the larger seat will flow enough fuel to run the engine at full throttel. The reason I got rid of the mechanical fuel pump is because it was putting out too much pressure and flooding the engine when I pulled the throttel back to idle when comming in to land.
I don't use the electric fuel pump for landing. (Had to come back and add this) The pump does not act as a restriction in the line, fuel will flow freely through it when it isn't running. Take care, Jim Chuk. Herman,I don't believe 8' of drop would be enough to push through the facet pump and the needle and seat. I have a 582 with the pulse pump but I also added a pitot tube to the cowl tank cap. My thought is the ram air pressure may provide sufficient pressure to the carbs. (8' of fuel drop is only.21 PSI) (Pitot at 70 MPH =.09 PSI).21+.09 = Maybe enough.DaveMore food for thought: I made the mistake of connecting the carb vents together and running them down and out the bottom.
The engine would run fine on the ramp but when I took off it caused a pressure drop in the float bowls and it would quit if brought to a low power setting. I want to thank everyone who posted ideas regarding my recent dead stick landing in my Kitfox on a 70 degree day.DBFox; you are correct, cowl tanks do not produce adequet gravity to the carb.I am more than ever convinced that my Jabiru quit due to carb.
Ice.When I first installed the Jabiru I was told by many that Bing constant velocity carbs. Do not ice by design.Maybe they will not if the carb. Air is coming from inside a warm cowl.I spoke with Dave Jalanti and he said he has experienced carb ice on his Jabiru's and always uses Carb heat when operating at reduced power.I fabricated a carb. Heat system but admit that I rarely use it because pulling the carb.
Heat on a Jabiru does not give a RPM drop like a Continental or Lycoming due to the altitude compensation feature of the Bing.I had descended from 9000 feet to 1500 feet at partial throttle and did not apply carb. Heat.The engine quit without warning and would not restart.It started an hour later with no issues.Next, I need to test how much heat my carb heat produces.Any suggestions how to do this?Thanks Herman.