Help! Metal in right wing tank

[JoeRuscito]

The particles are way smaller than the finger strainers. And you are correct the return line from header only goes to right tank. In the case of the IS the fuel
pumps move way more fuel than the engine uses so you do tend to see more than just air return to the right tank. But that returning fuel would have gone through the 6 micron filter after the fuel pump assembly and prior to entering the engine/injectors after passing the injectors it goes through the fuel regulator and a check valve than back to the header.

[HighWing]

A thought. Do you routinely fuel the right tank first. If so, there might be a bit of residue that settles somewhere in the fuel pump system that only makes it into the first wing tank filled.

[JoeRuscito]

Great thought. I’ll keep that in mind but if I recall the left was first ok this last fill up.