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AEM Adjustable Fuel Pressure Regulator Black ( Part Number:AEM 25-302BK)

AEM Adjustable Fuel Pressure Regulator Black - Universal

MODEL # AEM 25-302BK
Manufacturer Part # 25-302BK


MSRP: $174.66

In stock! Ships same day
Free shipping on all orders over $200.00!


RallySport Direct carries the AEM Universal Adjustable Fuel Pressure Regulator for those of you who are building a fuel system that is needed to support up to 1000 horsepower. 

Here are the details:

  • Patented interchangeable discharge ports enable the regulator's output to match the output of ay fuel pump
  • Tapped to accept a -6AN or 9/16" x 18 fittings
  • 1/8 NPT port for a fuel pressure gauge or pressure sensor pick up 
  • Black finish
  • Hardware and bracket included
| | | | |


Brand: AEM
Adjustable: Yes
Fuel Pressure Gauge Port Size: 1/8NPT
Inlet Size: -6AN
Outlet Size: -6AN

Mfgr. Warranty: 1 Year
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



Verified Purchase

2 years later it's leaking
Hellchaser 1 year ago
Developed a leak on the top of the fpr where the diaphragm is. Car has only been driven about 12,000 miles total. On E85 for the last 1,000 miles before I discovered it

Verified Purchase

Fuel Guage
bill23032 3 years ago
This product was easy to install and has provided the required assistance in setting up our rally car on the quick. We will be purchasing additional units for additional cars.

Solid Item
kewl_nate30462 3 years ago
If you are thinking of getting any sort of fuel upgrades for your car, this should be on the list. This FPR works great with the Injector Dynamics fuel rails since there both 6an O-ring fittings. This thing is made to last! My only though to make this FPR better would be to space the 4 bolts out more for the bracket as it only fits on horizontally and not vertically. Other then that this is a must buy!
Verified Purchase

works great
guest55c53165caae52790b8d38a5 4 years ago
i was on the fence about this regulator because of the description of what kind of fittings it uses. i had an aeromotive that went out on me so i needed one asap but didnt want to spend another 200 on an aeromotive one if the aem one could use the fittings i have. long story short, what aeromotive calls -6orb (for o-ring boss) is exactly the same as/another name for 9/16x18. this is also known as -6 o-ring from parts sites that specialize in fittings. the main difference between this regulator and the aeromotive as far as the fittings are concerned is if you use -6AN in the aeromotive the conical seat doesnt have a place to create a seal. this regulator is machined with a chamfer for the o-ring to sit in as well as the conical seat for regular AN adapter fittings.
Verified Purchase

Straight Forward
1FASTWREX 6 years ago
Great Product very straight forward install. A must item if you plan on running more boost and bigger turbo.

  • Q: 6an fittings?  iblackwe64800 2 years ago


    Does it come with these like your Tomei s product does or would you have to buy some?

    • A: This does not include the AN fittings.

      Nick S. 2 years ago
  • Q: Install  Gomesypoo 3 years ago


    I bought this regulator to for my 2002 wrx, and the mechanic said that it won't mount where the stock regulator is located. Do i need to purchase an install kit for this part and if so what kit should we use

    • A: This is a universal product and will require custom lines, fittings, etc for installation.

      Nick S. 3 years ago
  • Q: Fuel Bleed down  2010Fozziext 3 years ago


    How fast does the fuel bleed down on this regulator?

    • A: It will bleed down as soon as the key is turned off. They do not hold pressure for any significant amount of time.

      Trevor C. 3 years ago
  • Q: Stumble fix?  Jbrar 4 years ago


    I have a 2014 sti sedan that has stumble around the 3k rpm range and im not sure if im correct but i have read that to fix the issue you need to get the fpr from 06-07 sti or aftermarket fpr. So my question is would this fix that problem. And the only stumble fix kit ive seen is on the cobb website which has the hoses and connectors included. So is that needed to fix that or can i just hook this up to my stock lines? Ive read alot about this whole issue but alot of people are saying all sorts of things and im still confused.

    • A: An aftermarket fuel pressure regulator is one of many ways that has been known to fix a fuel stumble. Keep in mind this is a universal product and will be a custom fit with your vehicle.

      Nick S. 4 years ago
  • Q: 2010 wrx hatch  crystalmethodist78 4 years ago


    I want to use the 1000cc Injector dynamics along with this. Any fitment issues with my vehicle

    • A: This is a universal part and the installation will be custom. As long as you can mount the bracket and make fuel lines it should fit without an issue.

      Nick S. 4 years ago
Universal Product
This item is non application specific.
Please verify compatibility before purchase. May require some modification for proper installation.