PRODUCT DETAILS
AEM High Capacity Adjustable Fuel Pressure Regulator
Once you step up to a real pump and real injector, the factory regulator stops being a background part and starts being the thing that wrecks your tune. This AEM adjustable fuel pressure regulator, SKU: AEM-25-305BK, fixes that by controlling pressure without creeping when the pump flow climbs and boost stays in it for more than a quick pull. We run these exact regs on our own cars when we need repeatable fuel pressure, not guesswork.
You get a legit adjustment window here. The AEM 40 to 130 PSI FPR range makes it easy to set base pressure for everything from mild street setups to high boost fuel systems, and the set screw adjuster lets you lock it in without the touchy feel some regulators have. The big deal is the return side. This large return orifice FPR AEM setup keeps the regulator stable at idle and cruise even with high output pumps that love to overwhelm small bypass passages. If you have ever chased rich idle and weird trims after upgrading the pump, you already know why that matters.
On boost, it does the job the right way with a true 1:1 rising rate. Think AEM rising pressure FPR behavior, one PSI of fuel pressure for every PSI of boost, so injector delta pressure stays consistent and your fuel table stays honest. This is why people reach for an adjustable FPR high boost AEM choice instead of trying to make a smaller reg behave. It also plays nice with alcohol fuel and race fuel, so if your car drinks E85 or sees race gas at the track, you are covered. Ports stay clean with O ring sealing, you get AEM FPR 9/16"-18 fittings on the inlet and return, and the AEM fuel pressure regulator gauge port gives you an easy spot for a gauge or sensor.
Key Features
- AEM high flow fuel regulator that works when big pumps and big injectors stop being theoretical
- AEM 40 to 130 PSI FPR adjustment range with set screw adjustment that actually stays put
- Large return orifice FPR AEM layout to help prevent pressure creep and keep idle and cruise stable with high output pumps
- True 1:1 boost reference for boosted setups, high boost adjustable FPR AEM behavior you can tune around
- Compatible with alcohol fuel and race fuel, think adjustable FPR alcohol fuel AEM and AEM fuel regulator race gas use
- AEM FPR 9/16"-18 fittings with O ring sealed inlet and return ports
- AEM fuel pressure regulator gauge port, 1/8 NPT for a gauge or pressure sensor
- AEM adjustable regulator universal fitment, also known as AEM universal FPR 25-305BK, a solid AEM racecar FPR option for track focused builds
- High capacity fuel regulator AEM choice for long pulls, high boost, and setups that do not forgive fuel pressure drift