WingnutWick
Well Known Member
Hello all,
Took the 10 (IO-540 TITAN) to OSH this last week from CA and ended up having to leave her in Minneapolis due to fuel pressure issues that were concerning to me accompanied with some momentary pull backs of power.
Prior to OSH I noticed that the fuel pressures on a climb out began decaying slowly around 7 mins into the climb dropping into the yellow and if left into the red. Electric pump brings it back to nominal. Along with this I've noticed continuous fluctuations of a few PSI. I thought the fluctuations might be a sender issue so I replaced that prior to the trip which I thought fixed it on my local test flight but turned out it hadn't.
SYMPTOMS: With full power climb out the fuel pressures fluctuate +/- a few psi and then begin to decay to the yellow and red if left un boosted. Boost pump will get to normal numbers but the fluctuations remain even with boost pump on. At cruise, LOP the pressures will remain normal levels with engine driven pump but the fluctuations remain. If ROP, the pressures will decay, even at altitude. Fluctuations occur on deck even when at idle. VIDEO HERE or HERE
The last leg into OSH I noticed a little stumble/pullback on takeoff even with boost (electric) pump on (with fluctuations). Taking out of OSH multiple momentary decreases of power on climb out with boost pump on and larger fluctuations which tripped my comfort level and I ended up landing in KSTP and commercial air back. I have to return soon to fix it but wanted to get your inputs prior to doing so to see what thoughts are out there.
MY BEST GUESS: That the engine driven pump is failing with possibly a hole in the diaphragm which is causing it to be unable to keep up with extended demand and also possibly drawing air into the lines causing the fluctuations and power issues even with the electric pump on. Does this sound about right?
Standing by your valued inputs!
Videos of symptoms here:
https://drive.google.com/file/d/1orD02MdHaxMRLbIAUI87t_Ri7vMzYJ9T/view?usp=share_link
Took the 10 (IO-540 TITAN) to OSH this last week from CA and ended up having to leave her in Minneapolis due to fuel pressure issues that were concerning to me accompanied with some momentary pull backs of power.
Prior to OSH I noticed that the fuel pressures on a climb out began decaying slowly around 7 mins into the climb dropping into the yellow and if left into the red. Electric pump brings it back to nominal. Along with this I've noticed continuous fluctuations of a few PSI. I thought the fluctuations might be a sender issue so I replaced that prior to the trip which I thought fixed it on my local test flight but turned out it hadn't.
SYMPTOMS: With full power climb out the fuel pressures fluctuate +/- a few psi and then begin to decay to the yellow and red if left un boosted. Boost pump will get to normal numbers but the fluctuations remain even with boost pump on. At cruise, LOP the pressures will remain normal levels with engine driven pump but the fluctuations remain. If ROP, the pressures will decay, even at altitude. Fluctuations occur on deck even when at idle. VIDEO HERE or HERE
The last leg into OSH I noticed a little stumble/pullback on takeoff even with boost (electric) pump on (with fluctuations). Taking out of OSH multiple momentary decreases of power on climb out with boost pump on and larger fluctuations which tripped my comfort level and I ended up landing in KSTP and commercial air back. I have to return soon to fix it but wanted to get your inputs prior to doing so to see what thoughts are out there.
MY BEST GUESS: That the engine driven pump is failing with possibly a hole in the diaphragm which is causing it to be unable to keep up with extended demand and also possibly drawing air into the lines causing the fluctuations and power issues even with the electric pump on. Does this sound about right?
Standing by your valued inputs!
Videos of symptoms here:
https://drive.google.com/file/d/1orD02MdHaxMRLbIAUI87t_Ri7vMzYJ9T/view?usp=share_link
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