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Thread: What is this tube ?? 540i

  1. 02-23-2017, 02:47 PM #1
    Aftermarke7
    Aftermarke7 is offline Member
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    What is this tube ?? 540i

    What's the hard metal tube that's spans across the front of the engine and connects to both heads?
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  2. 02-24-2017, 08:22 AM #2
    White94RX
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    First guess would be the secondary air tube.
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  3. 02-27-2017, 03:54 PM #3
    Knownworldwide
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    I assume you are talking about the "U" shaped pipe under the engine cover? If so that is the fuel rail.
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  4. 02-27-2017, 03:57 PM #4
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    JimLev
    JimLev is offline Artifically Aspirated Moderator
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    Secondary air tube as White94RX mentioned is the correct answer.
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