Today was the 11th flight with my new -7, tach was around 19 hrs when it happened.
Until today, the fuel pressure has been steady at 27 PSI during flight.
About an hour into todays flight, (2:30 mins planned) I noticed that the fuel press was 32 PSI.
I kept an eye on it and about 10 mins later it was 35.
5 mins later it was 40.
The increase where slowly, so I assumed this probably wasn't an indicator malfunction. (No "jumpy" indications)
I decided to turn towards the homebase and during the turn it slowly climbed to 52 PSI.
I climbed to 8000' on course for home.
During the climb, the fuelpress decreased to 40 PSI.
After about 5 mins cruise at 8000' the fuel press decreased to 32 PSI
Here a pic:
A few minutes later, it climbed back up to 40:
When reducing power for landing, it climbed back up to 51 PSI.
I turned on the boost pump and it jumped to 55 PSI, so I quickly turned the boostpump off again.
When taxing in, the fuel press stayed at 51 PSI.
I pulled the cowls after shutdown and no leaks or blue stains anywhere.
Tomorrow I'll check the fuel filter.
I'll also check for good grounding at the fuel pressure sensor.
On my first -7 (Extreem IO-360 engine) the fuel press has been 30 PSI since the first flight.
On this -7, I've been satisfied with 27 since it has been steady.
The mechanical fuel pump was installed by Lycoming when I got the engine, so I haven't done anything with it.
Does anyone have an idea to what can be the cause of this?
To me, it looked like there really was a high fuel pressure and not an indicatotion problem, since the indications where so gradual.
Any ideas anyone?
Until today, the fuel pressure has been steady at 27 PSI during flight.
About an hour into todays flight, (2:30 mins planned) I noticed that the fuel press was 32 PSI.
I kept an eye on it and about 10 mins later it was 35.
5 mins later it was 40.
The increase where slowly, so I assumed this probably wasn't an indicator malfunction. (No "jumpy" indications)
I decided to turn towards the homebase and during the turn it slowly climbed to 52 PSI.
I climbed to 8000' on course for home.
During the climb, the fuelpress decreased to 40 PSI.
After about 5 mins cruise at 8000' the fuel press decreased to 32 PSI
Here a pic:
A few minutes later, it climbed back up to 40:
When reducing power for landing, it climbed back up to 51 PSI.
I turned on the boost pump and it jumped to 55 PSI, so I quickly turned the boostpump off again.
When taxing in, the fuel press stayed at 51 PSI.
I pulled the cowls after shutdown and no leaks or blue stains anywhere.
Tomorrow I'll check the fuel filter.
I'll also check for good grounding at the fuel pressure sensor.
On my first -7 (Extreem IO-360 engine) the fuel press has been 30 PSI since the first flight.
On this -7, I've been satisfied with 27 since it has been steady.
The mechanical fuel pump was installed by Lycoming when I got the engine, so I haven't done anything with it.
Does anyone have an idea to what can be the cause of this?
To me, it looked like there really was a high fuel pressure and not an indicatotion problem, since the indications where so gradual.
Any ideas anyone?
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