On the CFM 56 you can find MCDs and CDs which have a job of indicating an engine part that is failing, on the oil system of the engine.
I dont know the 757 at all but do they use MCDs in fuel or not?
I personally have never seen them on fuel lines.
Oh sorry CD stands for Chip Detector and MCD for Master Chip Detector.
My question is that if it was SWARF it must have been a booster pump structure failure because in my opinion if it was failing slowly slowly you would have had a decrease in pressure of the fuel.
On the other hand if it failed at once you would get booster pump low pressure in my opinion.
Did you have any of the above indications or it just failed out of the blue?
I dont believe it was fuel tank SWARF due to the fact that fuel tanks are integrally sealed with sealants to avoid any leaks and to stop any SWARF been dragged down the pipes.
But on the other hand we have seen cases of aircraft parts and systems failing whne they should not.