PRODUCT DETAILS
AEM Adjustable Fuel Pressure Regulator for Honda/Acura Civic, Integra, NSX
The AEM Fuel Pressure Regulator, SKU AEM-25-303BK, handles real fuel system demand on builds all the way up to 1,000 horsepower, assuming the rest of your setup keeps up. This uses AEM’s interchangeable discharge ports so you can match the outlet to what your pump and return system actually want, instead of forcing everything through a one size fits all hole. You get a single large discharge orifice plus a custom barb fitting for the factory fuel hose. The base comes tapped to accept AEM Regulator AN Fittings, either -6 AN or 9/16"x18, so you can keep it simple or convert the whole car to AN lines.
It also works as an AEM Boost Dependent Regulator with a 1:1 rising rate, so boost pressure bumps fuel pressure the same amount. That matters on turbo cars because it keeps injector differential pressure where your tune expects it. Adjustment range runs from 20 psi up to whatever your fuel pump can actually make. It’s a CNC-machined fuel regulator AEM built from 6061-T6 billet aluminum, so it feels durable and up to the task. It comes with all parts necessary for install.
Engine Fitments
B17A1/B18A1
C30A1, C30 B1/A6
D15B6/D16A - 1/6
G25A - 1/4
H22A1/H23A1 (must use AEM Fuel Rail)
1986 - 1993 Acura Integra 1988 - 1991 Honda Civic 1991 - 2001 Honda NSX
Mount the regulator directly to the OEM fuel rail or AEM High Volume Fuel Rail using the provided hardware. Adjust the fuel pressure as needed, following the comprehensive installation instructions included in the package.
CNC-machined from 6061-T6 billet aluminum, patented interchangeable discharge orifices, accepts -6 AN or 9/16"x18 fittings, adjustable from 20 psi to maximum fuel pump capacity, boost-dependent rising fuel pressure rate (1:1).