Fuel Pressure

by Mustafa Erhun Seyhan in 912 / 914 Technical Questions 8 years ago

My plane Tecnam p2006t, using 912s engine, fuel pressure dropped on flight. I checked all maintenance manuel, there wasnt any troubleshooting part about it. Should i do anything before change the fuel pressure sensor or fuel pump?

Re: Fuel Pressure

by Roger Lee » 8 years ago

Roger Lee

127 5.2k 4.78k

What was the fuel pressure and what did it drop to?

If it went way down and stayed there it very well could be the sender. That is a fairly cheap and easy part to replace to check and it's common. That said if that doesn't fix it it can be a few other things. Broken wire, bad ground, possible fuel pump issue, ect..

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Thank you said by: Mustafa Erhun Seyhan

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Re: Fuel Pressure

by Mustafa Erhun Seyhan » 8 years ago

Mustafa Erhun Seyhan

1 1 0

Fuel pressure value decrease approximately 3 value to 1.9 and 2 value. Thank you again.

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Re: Fuel Pressure

by Roger Lee » 8 years ago

Roger Lee

127 5.2k 4.78k

Hi Mustafa,

A couple of questions?
Any recent maintenance? Has the fuel pressure been normal and stable for quite some time and this new issue just popped up?

I believe this is bar times .1 That means your 3 is 4.2 psi and 2 is 2.8 psi. I hope I got that right?
Normal psi for the average user is 3.5 to 6 psi. Your normal would be 2.5 to 4.2. You should not be lower than 2.2 psi nor higher than 7.2 psi.
If it is 2.8 psi then the pressure is above minimum and with another flight may go back up. My guess here is the fuel pressure sender and placing an inline gauge and comparing it to the dashboard gauge could help confirm that.

Fuel pressure drops can be several things:
A bad pressure sensor (fairly common),
a bad ground wire or just a loose connection,
Air in the system especially after breaking open the fuel system can be common, but usually goes away,
possibly an intake leak on the fuel supply side,
Vapor production in the fuel hose,
a partial blockage in the fuel supply line before the fuel pump restricting fuel supply,

I don't think you have a pump issue until you prove the other things are not the cause.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Fuel Pressure

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