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  1. S

    Holley 12-840 fuel pressure regulator broken

    I had a issue recently with my Holley 12-840 0-9 psi fuel pressure regulator and found the problem and someone might have similar issues. My 440 had 6 psi fuel pressure when cold but when it warmed up the fuel pressure would drop to 3 psi. The adjustment on the regulator had no effect and did...
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