PQY Adjustable EFI Fuel Pressure Regulator 3–70 PSI AN8 feed AN6 return, billet aluminum high‑flow

PQY's Adjustable EFI Fuel Pressure Regulator Kit is a billet-aluminum, user-tunable regulator that controls fuel pressure from 3 to 70 PSI with AN8 feed and AN6 return fittings.

This compact, high-flow regulator is built for aftermarket EFI systems that need reliable, precise fuel pressure management. Machined from billet aluminum for durability, it includes multiple springs for low- and high-range operation, an AN8 feed with AN6 return plumbing, a gauge port, vacuum/boost reference, and hardware to suit common performance fuel setups. The kit is compatible with ethanol blends such as E85 and ships with straightforward installation guidance to help you integrate it into most custom or replacement fuel rails.

How do I set a target fuel pressure with this regulator?

Adjusting the PQY regulator is done via the top adjustment bolt. Turn the bolt to increase or decrease pressure; the kit includes springs selected for specific ranges so you can swap springs for finer control when tuning.

• Factory spring covers 20–45 PSI; included low and high springs extend range to 3–20 PSI and 45–70 PSI.
• Use a fuel pressure gauge (supplied) on the 1/8" NPT port to monitor changes as you adjust.
• Turn the top bolt clockwise to raise pressure, counterclockwise to lower it; make small incremental changes while the engine runs.

What ports and fittings does the kit provide for plumbing?

The kit is provisioned for common performance plumbing: AN8 inlet(s) for feed, an AN6 return, a gauge port, and a vacuum/boost reference. An end cap lets you close a second feed port if you only require a single inlet.

• Two OR8-to-AN8 fittings for feed options or loop-through configurations.
• One OR6-to-AN6 fitting for the return line to the tank.
• AN8 end cap to seal an unused feed port; 1/8" NPT gauge port included.

Is this regulator compatible with E85 and performance fuels?

Yes — materials and seals in the PQY regulator are intended for use with ethanol blends like E85 and other common performance fuels. Always verify seal compatibility with your exact fuel before prolonged use.

• Billet-aluminum body resists corrosion and heat common in performance environments.
• Seals and fittings are selected to tolerate ethanol where specified; check seals if you switch fuels.
• Designed for high-flow, high-demand EFI systems used in modified and race applications.

How difficult is installation and what’s included in the package?

Installation is straightforward for anyone familiar with aftermarket fuel plumbing; the kit contains the hardware and a printed instruction sheet to guide assembly and mounting. Basic tools and safe fuel-handling practices are required.

• Included: 1 fuel pressure regulator, 2 OR8-AN8 fittings, 1 OR6-AN6 fitting, 1 AN8 end cap, 2 springs, and 1 gauge.
• Instruction sheet provides mounting orientation, spring selection tips, and tuning suggestions.
• Requires AN-compatible lines/adapters and a secure mounting point near the fuel rail or return line.

Who is this for: The PQY Adjustable EFI Fuel Pressure Regulator Kit is aimed at tuners, DIY performance builders, and motorsport enthusiasts who need a robust, tunable regulator that supports a wide pressure range and ethanol fuels. It suits modified street cars, track machines, and custom EFI retrofits where precise pressure control and AN-style plumbing are preferred. If you want a durable, adjustable regulator with hardware for immediate installation and a wide PSI span, this kit provides the components and adjustability to get you running and tuning quickly.