Precision Raceworks MKV Toyota Supra Stand Alone AFS™ – B58 Engine

Overview

Once you add port injection to a direct-injected GR Supra (B58), the factory low-pressure fuel system becomes the weak link. The factory pump is controlled by PWM designed to reduce output once target fuel pressure (typically 5 bar) is reached — which puts it in constant conflict with any upgraded or added pump trying to feed port injection. On top of that, the high-pressure pump's control system dumps fuel back into the low-pressure system at high pressure/low volume, causing pressure oscillations that limit how consistently an upgraded pump can perform.

The Precision Raceworks Stand Alone AFS™ (Auxiliary Fuel System) solves this at the source: instead of trying to make the factory low-pressure system do double duty, it adds a completely dedicated, independent fuel system just for your port injection setup. Instructions are similar to the G8x/G2x kits.

SPECS

• Dedicated system: A fully separate low-pressure fuel system for port injection — completely independent of the factory pump and its PWM control
• Billet top hat: Billet aluminum top hat with 3 high-flow fuel ports
• Fully adjustable regulator: 1:1 boost-scalable billet fuel pressure regulator
• Filtration: 10-micron USA-made Microglass fuel filter, ideal for E85
• Lines: Smooth-bore, high-flow PTFE feed and return lines (AN6)
• Pump Selection: AFS.460 — single Walbro 535, 460 LPH @ 3 bar; AFS.640 — dual Walbro 450s, 640 LPH combined @ 3 bar; AFS.800 — dual Walbro 535s, 800 LPH combined @ 3 bar
• 100% ethanol compatible: All components rated for full E85 compatibility

PARTS INCLUDED

• Walbro fuel pump(s) per selected configuration
• Billet aluminum top hat and fuel pressure regulator
• 10-micron Microglass fuel filter
• PTFE feed/return lines and fittings
• Configurable pump activation harness

TECH RESOURCES

• Designed for use with a port injection kit where the fuel rail is mounted above the manifold. If you're running a plate-style spacer PI setup, contact Precision Raceworks directly before ordering to confirm compatibility.
• Some fuel rails may require a Male AN8-ORB to Female AN6-ORB adapter for compatibility (not included).
• At time of install, some wiring may need to be cut and spliced to connectors included in this kit.
• If your tuner wants Solid State Relays, one kit is needed per pump.
• Video Instructions - Click Here

Part Numbers: 601-0333 (AFS.460) / 601-0387 (AFS.640) / 601-0332 (AFS.800)

Vehicle Application