If you see air I doubt it is getting in through the inj's.

I'd look elsewhere.

When was the last time you changed the o-ring on the fuel filter bolt? A lot of us have been neglecting that one and getting caught by it recently. Also the oring onthe bango bolt on the IP between it and the block.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)