high pressure fuel pump on vectra c 2.2 z22yh

[duggie]

Hi been a while since being on here  any way lot of conflicting advise about the repair of these High pressure pumps. I fitted a repair kit on my HPP and filled with ATF  ran for 2 weeks but with no fast acceleration ( kick down ) but was told that ATF expands and blows seals so i drained the ATF a filled with 75w90 semi ( recommended ) 2 days later i had to boot it (kick down ) spanner light limp mode  so i stripped pump and oil seal was forward of shaft and the 3 round seals had  pieces  missing. Now was this due to the ATF expansion or overfill of the 75w90 oil or both.So now the question is what is the best / correct oil and how much i/e fill bleed then press button to expel excess oil if pressed to much will it empty all  the oil out also how to keep the 3 round disc sitting  in the correct position on reassembly bit of grease thanks for any info