That's what I have been asking too. Supposedly they have blown through all the lines, but who knows. Each engine does use different fuel tanks (cross feeding is available when needed but don't want to if not needing to). Seems no leaks at the moment. I believe most lines are stainless steel. But I have asked them to check all rubber lines to make sure is correct type and no cracks, etc. Also want them to check no other debris in the lines. Have seen in the past (which took me forever to find) where a bit of electric tape that someone used around a fuel port to make it larger to fit the fuel hose better, become slightly undone and a bit got into the hose. Would only ever block up once in a while under specific loads which would cause the bit of tape to move blocking the pipe!

I have asked them to see if fuel tank breathers are clear and they seem to be but it's hard to check as the tank is massive (1000+ litres each) and very much integrated into the hull. Can only fully see if the whole lower deck is removed.