When I worked at the airport - we did LOTS of "tune-ups" where we pulled the spark plugs and sand blasted the inside to clean them. They have a copper crush washer that deforms as you reach the required torque. We usually reused the copper washers- heated them up red hot and dunk in water- which annealed them back to dead soft- which allowed them to compress again (instead of being rigid from work hardening and vibration )
If I take my head off the do a head gasket change- can I do the same trick on the copper crush washers on the fuel supply lines ?
Or is there a reason that new ones would be better ?
Tim