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Aeromotive X1 fuel pressure regulator, return-style, black anodized
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  • Aeromotive X1 fuel pressure regulator, return-style, black anodized
  • -8 ORB side ports and bottom -8 ORB return on Aeromotive X1 regulator
  • 1:1 boost-reference barb (1/16 NPT) on Aeromotive X1 regulator
  • 1/8 NPT fuel pressure gauge port on Aeromotive X1 regulator body
Aeromotive X1 Fuel Pressure Regulators — Carb (3–20 PSI), EFI (35–75 PSI)

Aeromotive X1 Fuel Pressure Regulators — Carb (3–20 PSI), EFI (35–75 PSI)

$304.99 USD
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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.
EFI Standard (35–75 PSI)
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.

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

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.

Get the ORB⇄AN adapters

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