Description
Fuel Delivery · Regulator
Billet 6061-T6 regulator with a 1:1 boost reference and three swappable orifices — enough fuel control for builds to 1,000 hp.
20–150 PSIAdjustable range
1:1Boost reference
1,000 hpFlow capacity
3Included orifices
Overview
The AEM 25-302BK is a universal, adjustable rising-rate fuel pressure regulator CNC-machined from 6061-T6 billet aluminium with a black anodised finish. It fits a return-style fuel system and lets you set base fuel pressure from 20 PSI up to the limit of your pump. A 1:1 vacuum/boost reference adds one pound of fuel pressure for every pound of boost, so injectors stay correctly fuelled as the turbo spools.
Colour-coded, interchangeable discharge orifices (.100", .150", .200") let you match return volume to your pump for stable pressure, covering everything from a stock Honda pump to the largest aftermarket units. A 1/8" NPT gauge port makes precise tuning straightforward.
Specifications
Part number25-302BK (base part 25-302)
Material / finishCNC 6061-T6 billet aluminium, black anodised
Adjustable range20 PSI to max fuel-pump output
Factory preset40 PSI with .100" orifice fitted
Boost reference1:1 rising rate
Inlet ports2 × -6 AN (9/16"-18)
Outlet port-6 AN (9/16"-18); 7mm barb (25-390) sold separately
Gauge port1/8"-27 NPT
Included orifices.100" black, .150" silver, .200" gold
HP capacityUp to 1,000 hp (per AEM)
What's in the box
- Billet regulator (black)
- Bolt-on mounting bracket
- 4 allen-head mounting screws
- 3 interchangeable orifices (.100"/.150"/.200")
- Installation instructions
Fitment
ApplicationUniversal — return-style fuel systems; bolts to OE or AEM high-volume fuel rail
InstallRequires a return-style fuel system; -6 AN / 9/16"-18 fittings; connect 3/16" (5mm) vacuum reference
Universal part — confirm your fuel system is return-style and that fitting sizes and orifice suit your pump before ordering.
Best suited for
Turbo / supercharged
High-HP fuel systems
Return-style setups
E85 & pump-gas tuning
Factory 40 PSI is only a starting point — set base pressure to your vehicle with a fuel pressure gauge. AEM lists this as a competition/off-road part.
Fast dispatchShips in 24–48h
Genuine productAuthentic AEM
Easy returns10-day returns, unused items
Fitment helpWe'll confirm before you buy
Returns
Return within 7 days of purchase, provided the item is unused and in its original condition and packaging. Taxes are non-refundable.
We can’t take back parts that have been fitted or modified, unsealed electrical components, ECUs and sensors, opened gaskets, seals and o-rings, or clearance items. Parts we order in specifically for you can’t be returned for change of mind — we’ll tell you before you order if yours is a special order.
If a part is faulty, damaged in transit or isn’t what you ordered, we’ll put it right and cover the return shipping.
Please contact us before returning anything. Full terms are in our Refund policy.
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