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  1. S

    FASS in a M923 with Cummins 250

    I run a few different fass pumps on diesel motors and I noticed a noticeable difference on a 5.9. After the install the rpm at wide open shift was 150 rpm greater which was a very helpful on a stock motor. On my highly modded duramax there was also a noticeable increase in fuel flow with the...
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