Vacuum Pressure

[steve s]

Moritz Guage question on vac pressure. Does anyone know where the line is to the gauge I am told these deteriorate over time. I looked behind the panel, but couldn't locate it to replace it. 

[skykrawler]

I might be useful to provide information regarding the model and year of your airplane.

[Hank]

Mine comes from a T in the line above the oil filter and goes through the firewall. My gauge is at the top of the panel.

[Fritz1]

Think the vac line does not go to the Moritz but to a pressure transducer in the pilot footwell 

[steve s]

17 hours ago, skykrawler said:

I might be useful to provide information regarding the model and year of your airplane.

thanks 1999 Mooney Ovation

[steve s]

13 hours ago, Fritz1 said:

Think the vac line does not go to the Moritz but to a pressure transducer in the pilot footwell 

Thanks I will take a look. My vac pressure reads 3 even before I start the engine and just stays at 3. someone on here suggested the line has probably deteriorated 

[kortopates]

Thanks I will take a look. My vac pressure reads 3 even before I start the engine and just stays at 3. someone on here suggested the line has probably deteriorated 

If the line had merely deteriorated, it would read zero not three. You’re showing gauge error, regardless of what else may be wrong.


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[N201MKTurbo]

I have an old Bendix Pioneer 2” vacuum gauge I bought on EBay for $10. It is my gold standard for checking vacuum. It is dead on accurate. I checked it against a mercury column at the instrument shop. 

[steve s]

5 hours ago, kortopates said:

If the line had merely deteriorated, it would read zero not three. You’re showing gauge error, regardless of what else may be wrong.


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Turns out that's what it was. The line deteriorated and was no longer connected to the transducer. The transducer sits on top of the wheel well for anyone looking for it. There is a tee in the line behind the AI and the hose runs down to the transducer. Hope this helps someone else. It's a pain to get to and see what you are doing. 

Edited Sunday at 09:56 PM by steve s

[kortopates]

Turns out that's what it was. The line deteriorated and was no longer connected to the transducer. The transducer sits on top of the wheel well for anyone looking for it. There is a tee in the line behind the AI and the hose runs down to the transducer. Hope this helps someone else. It's a pain to get to and see what you are doing. 

Does it still indicate 3” when off?


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[steve s]

1 hour ago, kortopates said:

Does it still indicate 3” when off?


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No, now it shows zero, so it was likely showing atmospheric pressure. 5 when the engine is running