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CP4 pump model question

Moggie707 Jun 6, 2018

  1. Moggie707

    Moggie707 New Member

    Can anyone tell me what the H stands for in the model numbers on the pump.
    Eg. CR/CP4HS2/R90/40-S
    I am upgrading the pump in my audi a5 3.0tdi
    It seems that all the higher output engines seem to run a pump that has a H after the CP4.
    I know that R stands for right hand turning and that the bigger the number after the R means it should flow more fuel.
    I have found 2 pump that should be a direct bolt in.
    and also a

    Iv tried searching but with no luck.
    Can anyone help me please

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