PQY Adjustable EFI Fuel Pressure Regulator Hose Kit 3–70 PSI — Billet Aluminum, Braided AN6 Lines & Gauge

PQY's adjustable EFI fuel pressure regulator hose kit is a fully adjustable 3–70 PSI return-style regulator with AN fittings, braided lines, gauge and spare springs for use on EFI systems and E85-compatible setups.

This complete kit from PQY is built to let tuners, racers and performance-minded DIYers precisely control fuel rail pressure across a wide range of fuels, including ethanol blends. Machined from 6061-T651 billet aluminum and supplied with stainless braided hoses, multiple springs, and a 0–160 PSI gauge, the regulator is designed for durability and flexible tuning. The unit accepts AN feed and return fittings and includes a vacuum/boost reference port to integrate with boost-referenced fuel pressure strategies.

How does the regulator adjust fuel pressure and what parts are included?

Pressure is changed by rotating the adjustment bolt on the regulator cap and by swapping springs to change the mechanical range. PQY preinstalls a 20–45 PSI spring and supplies both a 3–20 PSI and a 45–70 PSI spring so you can set a broad variety of target pressures without aftermarket parts.

• Adjustable range: 3–70 PSI (spring-dependent)
• Included springs: 3–20 PSI and 45–70 PSI plus preinstalled 20–45 PSI spring
• Adjustment via top-mounted bolt for fine tuning
• 0–160 PSI gauge included for monitoring

Which fittings and ports does the kit provide for installation?

The regulator uses AN-style ORB6 ports for fuel feed and return connections and an 1/8" NPT gauge port. The kit arrives with AN6 fittings, three stainless braided AN6 hoses, and hardware to connect to most EFI systems, simplifying installation in many engine bays.

• Two ORB6 ports for AN8 feed and AN6 return options
• One ORB6 port dedicated for AN6 return line
• 1/8" NPT port for the included pressure gauge
• Three braided AN6 fuel lines and seven AN6 fittings included

Will this regulator work with E85 and other ethanol blends?

Yes — the PQY regulator and supplied braided fuel lines are compatible with E85 and alcohol-containing fuels. Materials and sealing components are chosen to resist ethanol corrosion and swelling that can affect inferior regulators.

• Compatible with E85 and high-ethanol mixes
• Stainless braided lines resist abrasion and fuel degradation
• Billet aluminum body provides corrosion resistance
• Suitable for universal EFI installations with return-style systems

How do I route the vacuum/boost reference line and why is it useful?

The regulator includes a vacuum/boost reference connection so fuel pressure can be linked to intake manifold pressure. Using this port lets you maintain a proper fuel pressure differential across injectors under boost or vacuum conditions, which helps ensure more consistent injector flow relative to engine load.

• Connect small vacuum hose from manifold to regulator reference
• Maintains fuel pressure differential during boost or vacuum
• Improves fueling consistency across operating conditions
• Important for turbocharged or supercharged applications

Who is this for: The PQY adjustable EFI fuel pressure regulator hose kit is aimed at automotive tuners, track-day enthusiasts, and anyone upgrading fuel delivery for forced-induction or ethanol-capable engines. It suits do-it-yourself installers who want a return-style regulator with the hardware to fit a wide range of EFI systems, plus tuners who need a broad adjustable range and accurate pressure feedback for mapping and performance work.