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Old 09-20-2018, 06:17 PM   #1
Join Date: Aug 2018
Location: Marengo, IL
Posts: 9
Default Bad Manifold Pressure readings

I have a Model 7 Kitfox that is new to me. It has a normally aspirated Rotax 912 ULS for a engine.

It has an electric manifold pressure gauge that reads about 23" on the ground with the engine shut down. In flight the gauge reads around 20" with full throttle at 1500'. The gauge does read less with less than full throttle. Question is it likely the sending unit or the gauge that is at fault?
The gauge face has a Vans logo on it. (if that's a clue)
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Old 09-20-2018, 08:55 PM   #2
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Join Date: Nov 2013
Location: Nampa, Idaho
Posts: 659
Default Re: Bad Manifold Pressure readings

A picture of the instrument would help or the brand & model number.

It could be either the instrument, sender or wiring.
Phil Nelson
A&P-IA, Maintenance Instructor
KF 5, Continental IO-240
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engine gauges, manifold gauge

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