PQY Adjustable EFI Fuel Pressure Regulator Kit 3–70 PSI AN8 Feed/AN6 Return — Billet Aluminium, E85 Compatible

PQY Adjustable EFI Fuel Pressure Regulator Kit delivers a precision, wide-range fuel pressure control from 3 to 70 PSI for street or race EFI systems.

This billet-aluminum regulator is engineered for tuners and installers who need a robust, adaptable fuel-pressure solution. It accepts AN8 feed and AN6 return plumbing, includes vacuum/boost reference capability and a dedicated gauge port, and comes with springs to cover low, mid and high pressure ranges. The kit also supports ethanol blends such as E85 and ships with fittings, an end cap for single-port setups, and installation guidance to simplify fitment.

How does this regulator adapt to different engine tunes and setups?

The PQY regulator uses interchangeable internal springs and a top-mounted adjusting bolt so you can dial system pressure quickly. It covers a broad 3–70 PSI span, making it suitable for low-pressure returnless builds and high-pressure race systems when combined with the appropriate spring.

• Comes with three spring options: factory mid-range plus supplied low (3–20 PSI) and high (45–70 PSI).
• Top bolt allows fine mechanical adjustment without disassembly.
• Vacuum/boost reference port enables pressure compensation for forced-induction engines.
• 1/8" NPT gauge port for direct pressure readout.

What fittings and hardware are included in the kit?

The kit arrives ready for common AN plumbing with included OR-to-AN fittings and an AN8 end cap so you can use either one or two feed ports. A pressure gauge is provided for initial setup and diagnostics.

• 2 × OR8-to-AN8 fittings for feed lines.
• 1 × OR6-to-AN6 fitting for the return connection.
• 1 × AN8 end cap to close unused feed ports for single-feed installations.
• 2 × spare springs and 1 × installed spring, plus a gauge and installation instructions.

Is this regulator compatible with E85 and other fuels?

The PQY regulator is machined from billet aluminum and designed to be compatible with ethanol blends including E85 when used with appropriate fuel hoses and fittings. It does not include internal materials that are incompatible with common high-ethanol fuels.

• Safe for E85 with proper fuel-system sealing and ethanol-rated hoses.
• Billet-aluminum body resists corrosion better than many die-cast alternatives.
• Use AN fittings and ethanol-compatible seals to avoid material degradation.

How do I install and tune the regulator for my vehicle?

Installation is straightforward for anyone familiar with AN plumbing and EFI systems: mount the regulator near the engine, connect AN8 feed and AN6 return lines, fit the gauge, and set the baseline pressure with the top bolt. Fine-tune pressure under load or with a handheld scanner for best results.

• Mount to a secure bracket clear of extreme heat sources and moving components.
• Hook vacuum/boost reference to manifold if using boost compensation.
• Start at recommended baseline pressure for your injectors, then adjust while monitoring the gauge.
• Swap springs for different pressure ranges rather than forcing the adjuster beyond its span.

Who is this for: The PQY Adjustable EFI Fuel Pressure Regulator Kit is aimed at performance enthusiasts, engine tuners, and professional installers who need a durable regulator with wide adjustment range and AN-style plumbing. It is a good choice for street cars with upgraded injectors, race applications requiring higher pressures, and any build converting to or using E85—provided the rest of the fuel system is ethanol-compatible. If you want precise, repeatable fuel-pressure control with straightforward plumbing and a complete hardware package, this regulator is designed for your project.