Home Forums Customer Support Pressure Regulators Bypass or Return Style Regulators 515 Can't lower fuel pressure below 75PSI

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  • March 10, 2016 at 9:26 pm #6539

    Ryan

    Using a 340LPH in tank transfer pump to 2 450LPH surge tank pumps I cannot get the 515 regulator to set fuel pressure lower than 75PSI. The adjustment is completely maxed to lower the pressure but I still cant get lower than 75PSI. Is this regulator just not capable of controlling the pressure or is there another issue?

     

    March 10, 2016 at 9:58 pm #6540

    Fuelab

    This is assuming you’ve verified that your gauge is not the problem…..

    You’re either overrunning the regulator (meaning it’s undersized for your application) or there’s a restriction in the return line. If you’re running both of those pumps full time, you’re most likely overrunning the regulator (assuming it’s a standard seat 515 series. If the pressure is still too high with only one pump running there’s a restriction in the return line. Said restriction could either be a line that’s too small, too many bends (especially via the cheap drilled 90*’s rather than pipe bends), or a vent line that’s too small between the surge tank and main tank and/or the main tank and atmosphere.

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