{"product_id":"precision-raceworks-stand-alone-auxiliary-fuel-system-bmw-g8x-g2x","title":"Precision Raceworks Stand Alone Auxiliary Fuel System - BMW G8X\/G2X","description":"\u003cp\u003ePrecision Raceworks' Stand Alone Auxiliary Fuel System (AFS) gives your G8X\/G2X's port injection its own dedicated low-pressure fuel system, separate from the factory main pump.\u003c\/p\u003e\n\u003cp\u003eOnce a car runs port injection alongside its factory direct injection, the usual approach is to push more fuel through the existing low-pressure system. The problem is that the factory pump is controlled by a PWM controller that pulls output back down once it hits target fuel pressure, and the high-pressure pump dumps fuel back into that same low-pressure system in pulses, causing pressure oscillation that the car's direct-injection system has to keep correcting for. A dedicated AFS sidesteps that entirely: it's a standalone low-pressure circuit built only to feed port fueling, with its own pump, filter, and adjustable regulator.\u003c\/p\u003e\n\u003ch3\u003eWhy a Dedicated AFS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFuel pressure stays stable regardless of what the main DI fuel system is doing\u003c\/li\u003e\n\u003cli\u003ePressure can be scaled 1:1 with boost\u003c\/li\u003e\n\u003cli\u003eSmaller injectors can be run at higher resolution while still flowing more fuel than larger injectors on the stock system\u003c\/li\u003e\n\u003cli\u003eLess correction demand on the car's factory DI fueling\u003c\/li\u003e\n\u003cli\u003eSimplifies tuning of the port injection side\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConstruction\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBillet aluminum top hat with 3 high-flow fuel ports\u003c\/li\u003e\n\u003cli\u003eFully adjustable, 1:1-scaling billet fuel pressure regulator\u003c\/li\u003e\n\u003cli\u003e10-micron, USA-made Microglass fuel filter, rated for E85\u003c\/li\u003e\n\u003cli\u003eSmooth-bore, high-flow PTFE AN6 feed and return lines\u003c\/li\u003e\n\u003cli\u003eBillet fittings on all fuel line and top-hat connections\u003c\/li\u003e\n\u003cli\u003ePlug-and-play connectors inside and outside the top hat, with AN8 fuel-rail adapters included, so the factory harness does not need to be cut or spliced\u003c\/li\u003e\n\u003cli\u003eConfigurable pump activation harness\u003c\/li\u003e\n\u003cli\u003e100% ethanol-compatible components\u003c\/li\u003e\n\u003cli\u003eCompatible with a stock or upgraded primary (DI) fuel pump\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing a Configuration\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eMPN\u003c\/th\u003e\n\u003cth\u003ePump(s)\u003c\/th\u003e\n\u003cth\u003eCombined Flow\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAFS.425\u003c\/td\u003e\n\u003ctd\u003e601-0281\u003c\/td\u003e\n\u003ctd\u003e1x Walbro 450\u003c\/td\u003e\n\u003ctd\u003e425 LPH @ 3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAFS.460\u003c\/td\u003e\n\u003ctd\u003e601-0282\u003c\/td\u003e\n\u003ctd\u003e1x Walbro 535\u003c\/td\u003e\n\u003ctd\u003e460 LPH @ 3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAFS.640\u003c\/td\u003e\n\u003ctd\u003e601-0283\u003c\/td\u003e\n\u003ctd\u003e2x Walbro 450\u003c\/td\u003e\n\u003ctd\u003e640 LPH @ 3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAFS.745\u003c\/td\u003e\n\u003ctd\u003e601-0284\u003c\/td\u003e\n\u003ctd\u003e1x Walbro 450 + 1x Walbro 535\u003c\/td\u003e\n\u003ctd\u003e745 LPH @ 3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAFS.800\u003c\/td\u003e\n\u003ctd\u003e601-0285\u003c\/td\u003e\n\u003ctd\u003e2x Walbro 535\u003c\/td\u003e\n\u003ctd\u003e800 LPH @ 3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eThese kits are designed for a port injection setup with the fuel rail mounted above the manifold. If you're running a plate-style spacer PI system, contact your BMP Tuning rep to confirm compatibility before ordering.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBillet top hat with adjustable 1:1 fuel pressure regulator\u003c\/li\u003e\n\u003cli\u003eDedicated fuel pump(s) for the selected configuration\u003c\/li\u003e\n\u003cli\u003e10-micron Microglass fuel filter\u003c\/li\u003e\n\u003cli\u003ePTFE AN6 feed and return lines\u003c\/li\u003e\n\u003cli\u003ePlug-and-play wiring harness and AN8 fuel-rail adapters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePlug-and-play connectors mean the factory harness does not need to be cut or spliced for installation\u003c\/li\u003e\n\u003cli\u003eIf your tuner wants solid-state relay control, a separate relay kit is needed per pump; a two-pump configuration (AFS.640, AFS.745, or AFS.800) needs two relay kits\u003c\/li\u003e\n\u003cli\u003eProfessional installation and tuning by someone experienced with port injection systems is recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Precision Raceworks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Base Pressure:\u003c\/strong\u003e 43.5 psi-g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Fuel Pressure:\u003c\/strong\u003e 110 psi-g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Output Ports:\u003c\/strong\u003e 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Return Ports:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Weight:\u003c\/strong\u003e 11 lbs (single-pump configurations) or 14 lbs (dual-pump configurations), including lines and harness\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need to cut my factory wiring harness to install this?\u003c\/strong\u003e\u003cbr\u003eNo. This system uses plug-and-play connectors and included AN8 fuel-rail adapters, so no cutting or splicing is required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich configuration do I need?\u003c\/strong\u003e\u003cbr\u003eIt depends on your port injection fuel demand and tune. Contact your BMP Tuning rep or your tuner to confirm the right AFS size for your build.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this replace my main fuel pump?\u003c\/strong\u003e\u003cbr\u003eNo. It's a dedicated, standalone system for port injection only, and works alongside your stock or upgraded primary DI fuel pump.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this compatible with E85?\u003c\/strong\u003e\u003cbr\u003eYes. Every component in the kit, including the filter media, is rated for 100% ethanol.\u003c\/p\u003e","brand":"Precision Raceworks","offers":[{"title":"Default Title","offer_id":43595886034992,"sku":"P07W 601-0281","price":1499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/4573\/7776\/files\/NEWFUELPUMPSETUP-1_375159c6-9bfb-4513-9715-a183a260d144.jpg?v=1788953169","url":"https:\/\/3pedalsbetter.com\/products\/precision-raceworks-stand-alone-auxiliary-fuel-system-bmw-g8x-g2x","provider":"3Pedals Better","version":"1.0","type":"link"}