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Check Fuel Pressure Video

in 912 / 914 Technical Questions 9 years ago
In the "Check Fuel Pressure" video, the fuel line "T"(Clamp Block) point where the gauge is fitted is described as 1/8 (NPT I'm guessing?).
My 2012 912ULS has a M10 X 1.0 plug, which is a parallel thread as per a typical banjo bolt seal with a copper washer so the video would not be correct for me.
Was there a thread change here? If so, when?


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  • Re: Check Fuel Pressure Video

    by » 9 years ago

    You can use 1/8 NPT in this 10mm thread. This is confirmed with Rotax engineering.
    The certified aircraft have been using a 1/8NPT fuel pressure sensor in this port since the 1980's with no problem. Use loctite 243 or pipe sealant and don't over-torque it.
      
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  • Re: Check Fuel Pressure Video

    by » 9 years ago

    I used an M-10 to 1/8 adapter for mine.
      
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  • Re: Check Fuel Pressure Video

    by » 9 years ago

    why add another failure point?
      
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  • Re: Check Fuel Pressure Video

    by » 9 years ago

    I agree with you Marv. The aluminium "clamp block" already has thin side walls.
    The 1/8npt is a tapered thread so as you screw it in the loads/force at the start of the thread on the clamp block increase.
    My friends 2006 model looks to have a steel clamp block and is tapped 1/8npt.
    I don't believe any fuel fitting should be aluminium. Especially this one being central and on top of the engine. I tried a 1/8 npt gauge into the M10 X 1 hole and got about 2 turns in.
    Not good enough in my opinion.
    I will be using the CORRECT fittings in the CORRECT thread.
      
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  • Re: Check Fuel Pressure Video

    by » 9 years ago

    Do not use a M10 x 1 with a 1/8 NPT thread. These threads couldn't be more different. One is a Metric parallel thread, the other is an imperial tapered thread. The threads have different thread angles and radii and are different pitches. A very cheap adapter can be used which is the correct thing to do, that is what adapters are for.

    Square peg and round hole spring to mind.

    Mark
    Thank you said by: Rhett Mitchell
      
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