Didn’t get to select L or R side when ordering.
Didn’t get to select L or R side when ordering.
The hose and fittings are nice quality. Their ability to get stuff shipped out quickly dose not happen.
It took a week to get my order to shipping.
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Aeromotive X1 Fuel Pressure Regulators — Carb (3–20 PSI), EFI (35–75 PSI)
$304.99
Free Shipping $99+
Lifetime Warranty
Expert Support
Reliable shipping
Aeromotive X1 Series Fuel Pressure Regulators — Return-Style (Carb & EFI)
One regulator family, three ways to win. The X1 Series gives you clean, stable pressure control for carb and EFI, naturally aspirated or boost. All variants use large -8 ORB ports, a 1/8" NPT gauge port, and a 1:1 boost reference for forced induction. Pick your pressure range and flow seat, plumb it once, and go.
Which X1 do I need?
Carb (3–20 PSI)
Blow-through or NA carbs. High-flow .313" seat. Up to ~150 GPH with -8 return.
Blow-through or NA carbs. High-flow .313" seat. Up to ~150 GPH with -8 return.
EFI Standard (35–75 PSI)
Street/strip EFI. .188" seat. Up to ~150 GPH with -8 return.
Street/strip EFI. .188" seat. Up to ~150 GPH with -8 return.
EFI Pro (35–75 PSI, High Flow)
Big pump / multi-pump builds. .313" seat. Up to ~250 GPH with -8 return.
Big pump / multi-pump builds. .313" seat. Up to ~250 GPH with -8 return.
Why builders choose X1
- Stable control: precise base pressure with true 1:1 boost reference for forced induction.
- Grows with you: swap internal seat/spring kits later (carb ⇄ EFI, standard ⇄ high-flow) without re-plumbing.
- Easy plumbing: (2) side -8 ORB in/out + (1) bottom -8 ORB return; 1/8" NPT gauge port and 1/16" NPT boost barb.
- Fuel compatible: gasoline, ethanol, methanol/alcohol, and diesel.
- Bracket included: mount cleanly on rails, firewall tabs, or chassis plates.
Variant details
| Variant | Pressure Range | Return Seat | Max Flow (with -8 return) | Ports | Extras | Use For |
|---|---|---|---|---|---|---|
| Carb — Standard Return | 3–20 PSI | .313" high-flow | ~150 GPH | (2) -8 ORB side in/out, (1) -8 ORB bottom return; 1/8" NPT gauge; 1/16" NPT boost barb | Bracket included; service/conversion kits available | NA & blow-through carb systems |
| EFI — Standard Return | 35–75 PSI | .188" standard | ~150 GPH | (2) -8 ORB side in/out, (1) -8 ORB bottom return; 1/8" NPT gauge; 1/16" NPT boost barb | Bracket included; service/conversion kits available | Typical street/strip EFI (up to A1000 pump) |
| EFI Pro — High-Flow Return | 35–75 PSI | .313" high-flow | ~250 GPH | (2) -8 ORB side in/out, (1) -8 ORB bottom return; 1/8" NPT gauge; 1/16" NPT boost barb | Bracket included; service/conversion kits available | High-output & multi-pump EFI builds |
Compatibility & conversion
All variants use -8 ORB ports. Select seat size for your pump flow: .188" seat for standard EFI flow; .313" seat for high-flow or multi-pump systems. X1 internals can be swapped later with service/conversion kits (seat + diaphragm/poppet + spring), so you can change pressure range/flow without re-plumbing.
Install notes
- Return-style plumbing: feed → rails/filters → regulator → -8 AN return to tank.
- ORB ports: use the supplied O-rings; do not apply thread tape/paste to ORB threads. The AN flare joints seal on the 37° seats—no sealant.
- Set base pressure with vacuum/boost line disconnected; reconnect for 1:1 rising rate under boost.
- Mount away from headers/exhaust; bracket is included.
Pair it with proven components
Aeromotive Inline Filter (AN male)
High-flow filtration upstream of the rails Aeromotive Inline Filter (ORB ports)
Direct-to-regulator with ORB fittings ORB ⇄ AN Adapters
-8 ORB to AN male adapters for plumbing
High-flow filtration upstream of the rails Aeromotive Inline Filter (ORB ports)
Direct-to-regulator with ORB fittings ORB ⇄ AN Adapters
-8 ORB to AN male adapters for plumbing
What’s included
- (1) Aeromotive X1 Series regulator (choose Carb, EFI Standard, or EFI Pro).
- Mounting bracket and gauge port plug. (Hose ends/adapters sold separately.)
Safety: Relieve fuel pressure before service. Check for leaks after setting base pressure. Follow OEM/ECU tuning guidance when changing fuel pressure.