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  1. #1
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    Normal water psi? 300 promax

    Trying to find correct info on normal water pressure for 1999 300 promax?

  2. #2
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    0-5 at idle and anything near 10 at wot is normal. Its volume not pressure with a 3 liter.
    JMO

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  4. #3
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    Ya mine is 5 at idle and 12 or so WOT, they are pretty reliable pumps and impellers,they will lose WP over time from the bottom gasket tearing up. Unless you have the updated steel shim gasket.mine pees at idle like a cow on a flat rock,all the volume
    Last edited by Varmint; 09-14-2018 at 03:23 PM.

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