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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Mon Jul 31, 2006 5:19 am Post subject: Engine Fuel Return Line |
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I have a question about the engine fuel return line on my Rotax 912UL, you know the one running from the neck-5 fuel manifold back to the main fuel tank? In addition to the orifice in the manifold outlet going to the pressure gauge, the outlet for the hose going back to the main fuel tank has an orifice also. Does this line constantly return a certain amount of fuel to the tank? If so, why? What is it’s function and why does it have an orifice in it? I would really like to understand this!
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Hugh McKay
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paul.mitchell2(at)homecal
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| Posted: Mon Jul 31, 2006 7:18 am Post subject: Engine Fuel Return Line |
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Hugh,
The orifice in the line to the fuel pressure sensor is to stop pulsations at the fuel pressure gauge.
The orifice in the return line to the tank is to get rid of air or vapour locks, especially if using mogas. It obviously has to be a restriction or you would not have any fuel pressure to the carburettors. I cannot remember how much fuel goes back to the tank, maybe gallon an hour. I know if I fly for three hours on both tanks on my Tecnam Sierra , the right tank has some 2 gallons less than the left, some from the right returning to the left tank.
Paul Mitchell
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