Product Summary

Universal Fit, 40-130 Fuel Pressure Rating (psi)

    Key Specs

    MFG. Part #25-305BK
    BrandAEM Electronics

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    AEM Electronics 25-305BK Details

    AEM's High Cap Universal Adjustable Fuel Pressure Regulator (PN 25-305BK) is the perfect solution for racers who need reliable fuel pressure in high-boost vehicles and racecars that require a large volume of fuel delivery. A longer spring provides for a wider range of adjustment (from 40 to 130 PSI). An easy-to-adjust set screw stands up to repeated adjustments.

    A single large return orifice is designed to handle high rate flow pumps. The regulator has a 1:1 rising pressure rate for boosted applications, and it is alcohol fuel and race fuel compatible. The High Cap Universal FPR is tapped to accept a 9/16”-18 O-Ring sealed fittings for inlet and return, and includes a 1/8 NPT port for a fuel pressure gauge or pressure sensor pick up.


    • Universal fuel pressure regulator adapts to virtually any vehicle
    • Longer spring for wider range of adjustment (40 – 130 PSI)
    • Single large return orifice accommodates very high flow rate pumps
    • Boost dependent rising fuel pressure rate (1:1)
    • Three 9/16"-18 ORB O-ring style inlet ports (2 inlets, 1 return)
    • Easy to use adjustment screw
    • Integrated 1/8" NPT gauge port
    • 5mm (3/16") vacuum hose
    • Alcohol fuel and race gas compatible
    • CNC-machined from 6061-T6 billet aluminum
    • Patent # 6,298,828

    CARB Warning

    For race/ off road use only

    Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

    AEM Electronics 25-305BK Specifications

    MFG. Part #25-305BK
    BrandAEM Electronics
    Fuel Pressure Rating (psi)40-130
    Regulator StyleReturn
    Inlet Fitting-6 AN Female O-ring
    Outlet Fitting-6 AN Female O-ring
    Sold in QuantityEach
    Boost/Vacuum Reference PortYes
    Gauge PortYes
    Fittings IncludedNo
    Inlet QuantityOne
    Outlet QuantityOne
    Boost/Vacuum Rise Ratio1:01
    Regulator LocationInline
    GTIN Code840879025953
    Regulator MaterialAluminum
    Regulator FinishBlack anodized
    Mounting Bracket IncludedYes