Discussion off all the ADs.
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.
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.
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.
Last edited by tafisama on Sun Sep 20, 2020 12:13 pm, edited 1 time in total.
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.