Fuel pressure issues causing Fadec Warning

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Bigphoto
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Re: Fuel pressure issues causing Fadec Warning

Post by Bigphoto »

Is there any difference with running your aux fuel pump on in terms of the PSi? Might need to either rebuild your fuel pump or replace?
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Re: Fuel pressure issues causing Fadec Warning

Post by tafisama »

Bigphoto wrote: Fri Sep 11, 2020 2:55 pm Is there any difference with running your aux fuel pump on in terms of the PSi? Might need to either rebuild your fuel pump or replace?
Running the boost pump by manually putting the switch to on makes it worse and returning it to auto it goes back to the previous running state.My pump number is 655157-2A2.I thought it was supposed to be 655157-3A2.I am not sure if that is the right number.
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Re: Fuel pressure issues causing Fadec Warning

Post by ATCguy »

I don't know about the pump number. I just finished replacing the fuel filters and all the o-rings between the pump and the fuel distribution block filter and that seems to have cleared up the issue with the slowly leaking down pressure I was having.
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Re: Fuel pressure issues causing Fadec Warning

Post by tafisama »

Just a quick update.The pump was tested on the bench and it is fine.It`s working well so I have been saved lots of money.We refitted it and started trouble shooting.I am disappointed with myself because we did not clean filters according to instruction in the IOF-240B Engine Manual.After much tussling the 10Micron filter was the biggest culprit.When we opened the top cover it was full of fuel but the fuel block itself didn`t have that much.We took a chance to just prove it was the filter and ran the engine without it and pressures were fine,no engine loosing rpm and power,sat it for 5mins at full throttle.No lights whatsoever and pressure was steady at 47psi at 2200rpm.We had to soak the filter in cleaner over night.Yeah the cleaner was black and after the cleaning we fitted it and I took off.The pressures were on the low side about 3 psi lower at higher rpms which occasionally triggered the lights during high altitude climbs.Below 2400Ft agl lights were not coming on at all.I decided to have the 32Micron filter out for cleaning.I have it being soaked in cleaner overnight and will fit it in the morning and make any adjustment as required then if weather is good,I will take it up and observe.I will update in the next few days.
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Last edited by tafisama on Sun Sep 20, 2020 12:13 pm, edited 1 time in total.
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Re: Fuel pressure issues causing Fadec Warning

Post by tafisama »

N645XL wrote: Sun Aug 30, 2020 12:51 pm Gasolator cleaned & installed correctly during annual? Fuel tank vent pipe unobstructed?
The filters were not cleaned properly. I am disappointed with myself.We did not follow the instructions of using Ultrasonic cleaner.We had to soak the 10Micron filter overnight and there was a lot of improvement and I now have the 32Micron filter being soaked overnight as well.The pump was tested and it has no issue at all.We did not use a mechanical gauge because my Lame was very positive it was the pump but now he cant believe how wrong he was.The Mechanical gauge would have led us to the filter by showing higher pressure when the VM was showing low pressure and this would have led us to the filter early.It`s all part of the learning curve.
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Re: Fuel pressure issues causing Fadec Warning

Post by N645XL »

Thanks for the update. Good lessons learned.
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Re: Fuel pressure issues causing Fadec Warning

Post by paulmilo »

Wow, ok that makes sense' although surprised they were as dirty as that. Thanks for the update.
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Re: Fuel pressure issues causing Fadec Warning

Post by tafisama »

I went up the other day and after 25mins boom the Fadec Caution comes on,pushed a little further Fadec Warning and zero fuel pressure on the VM.Throttle back lights disappear and pressure goes up again.Returned to the airport using 2300rpm but a bit slower.I had been keeping an eye on the Fuel pressure on the VM and it never went above 50psi whereas at 2670rpm it should have been around 55psi.The VM history also confirmed the figures.I had to get the higher end pressure adjusted and the idle one dropped to 33psi at 850rpm with Boost pump off.I then did 6 circuits which was 1.1hrs without any light coming on and the higher end pressure got to 52psi at 2450rpm which I believe is right.Before the circuits I had 50lts of fuel added and after parking I decided to check tank breather by removing the fuel cap.It was like stuck or glued,I had to forcefully wiggle the locking lever to get it unstuck/off.Looks like N645XL was right.The tank might not be breathing properly and things went haywire during the annual.The aircraft was not started for 10weeks as we waited for the propeller.Issues with filters not being clean point to previous annuals not being done properly with regards to the cleaning procedure.My next flight flight will iron out tank venting or pump.If the pressure keeps dropping after 30mins in continuous flight then the pump is gone and not holding pressure when hot.
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Re: Fuel pressure issues causing Fadec Warning

Post by N645XL »

For consideration only, IF your fuel tank is contaminated and the contamination blocked the filter once your filter could be contaminated again. Just thinking with the keyboard. Good luck!
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Re: Fuel pressure issues causing Fadec Warning

Post by paulmilo »

Lack of venting sounds more logical than a pump failing when warm. Start with the simple stuff first is always a good start IMO.

Your symptoms of fuel starvation at a constant cruise after about 30 minutes, for me anyway, points at a vacuum forming. The filters probably just added to the problem, so cleaning them helped, but did not solve the problem.

Your circuit pattern work (which sound like a series of mini cross country navs LOL - I complete ~10 ccts /hr, but it’s an uncontrolled airport) would have lots of different power settings and attitudes that may help mask the vent issue, so it might not be a great comparison to a cruise.

I would check that the lines don’t have the remnants of a wasp nest or something in there as the plane was in TSV for a while sitting on the ground I suspect. Plenty of insects up there!
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