I have just been looking at another log from yesterday where the LTFRs increase with revs and drop back to 0 at idle. From the information that I have read this indicates a fuel flow or MAP/MAF sensor issue. However, the rail pressure is remaining high during the log although the AFRs are running lean. Can the HPFP have high pressure but low flow? I have changed the MAP and MAF sensors before without change but I will clean them again and see if anything changes.