PQY EFI Fuel Pressure Regulator Kit AN8 feed AN6 return with 0–160 PSI Gauge — Billet Aluminum, Adjustable Vacuum/Boost

The PQY EFI Fuel Pressure Regulator Kit is a billet-aluminum, adjustable return-style regulator with AN8 feed, AN6 return ports and a 0–160 PSI gauge for precise EFI fuel pressure control.

This complete regulator kit is built for modern EFI systems and flex-fuel setups such as E85 or alcohol blends. Machined from 6061-T651 aluminum, the regulator provides a vacuum/boost reference, a threaded gauge port, and ORB-style fittings for secure AN connections. The package supplies the most common fittings and a 0–160 PSI analog gauge so you can set and monitor fuel pressure without buying extra hardware.

How does this regulator work with an EFI setup?

The PQY regulator controls fuel pressure by returning excess fuel back to the tank, keeping injector feed pressure stable across load changes. You mount it inline on the fuel rail return line and connect the vacuum/boost reference for pressure compensation. Adjustment is made by turning the top adjustment bolt to reach the desired psi range.

• Return-style design uses AN8 feed and AN6 return ORB ports for secure plumbing.
• Vacuum/boost reference port for pressure compensation under varying intake conditions.
• Integrated 1/8" NPT gauge port accepts included 0–160 PSI gauge for monitoring.
• Adjusts roughly between 60 and 85 PSI by turning the top bolt.

What fittings and components are included in the kit?

The kit ships with the regulator body, a 0–160 PSI gauge, and AN fittings to connect feed and return lines commonly found on performance fuel systems. An AN8 cap and the necessary AN8 feed and AN6 return fittings are provided so you can install the regulator without sourcing multiple adapters.

• 1 × PQY fuel pressure regulator (6061-T651 billet aluminum).
• 1 × 0–160 PSI analog gauge installed via the 1/8" NPT port.
• 2 × AN8 fittings for feed/supply and 1 × AN6 fitting for return.
• 1 × AN8 end cap for sealing unused ports; thread sealant required (not included).

How do I adjust and monitor fuel pressure safely?

Adjustment is straightforward: loosen the lock (if fitted), then turn the top bolt to increase or decrease pressure while watching the gauge. Because this regulator operates at relatively high pressure and with flammable fuels, professional installation is recommended and thread sealant must be used to prevent leaks.

• Adjust by turning the top adjustment bolt; range approximately 60–85 PSI.
• Monitor fuel pressure with the included 0–160 PSI gauge during tuning.
• Use proper AN hoses, clamps, and thread sealant; inspect for leaks before running.
• Consider professional installation if you’re unfamiliar with fuel systems.

Will this work with E85 or alcohol-blended fuels?

Yes — the PQY regulator is compatible with E85 and alcohol blends when paired with appropriate fuel system components that tolerate those fuels. The aluminum construction and ORB/AN fittings are commonly used in ethanol-capable setups, but seals and hoses must also be ethanol-compatible to avoid premature degradation.

• Compatible with E85 and alcohol-gasoline blends when paired with ethanol-rated lines and seals.
• Billet aluminum body resists corrosion compared to some cast materials.
• Vacuum/boost reference maintains consistent pressure across varying engine loads.
• Not a complete fuel-system upgrade by itself; verify injectors and pump capacity.

Who is this for: The PQY EFI Fuel Pressure Regulator Kit is aimed at tuners, motorsport enthusiasts, and professionals upgrading EFI fuel systems or converting to higher-flow setups. It’s a practical choice if you need an adjustable, return-style regulator with AN fittings and onboard pressure readout. Recommended for users comfortable with fuel plumbing and who will apply proper thread sealant and ethanol-compatible components; professional installation is advised if you lack fuel-system experience.