{"product_id":"stanadyne-rgx-12mm-high-pressure-fuel-pump-for-gm-ltx","title":"Stanadyne RGX 12mm High-Pressure Fuel Pump for GM LTx","description":"\u003ch2\u003ePurpose-Built Direct-Injection Fueling for Serious GM LTx Power\u003c\/h2\u003e\u003cp\u003eThe Stanadyne RGX is not a modified production pump. It is a purpose-built 12.0 mm high-pressure direct-injection pump engineered for builders, tuners and race teams pushing GM Gen V LTx combinations beyond the practical limits of OE-style fuel-pump capacity.\u003c\/p\u003e\u003cp\u003eStanadyne validated the RGX through more than 500 hours of durability testing on both 7.85 mm and 8.2 mm fuel-lobe configurations. The redesigned lower assembly, upgraded spring system and optimized internal discharge passages are built to maintain stable, efficient fuel delivery under high lift, high engine speed and wide-open-throttle operation.\u003c\/p\u003e\u003ch3\u003eRGX Performance Highlights\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePurpose-built 12.0 mm plunger high-pressure pump\u003c\/li\u003e\n\u003cli\u003eDLC-coated bore and piston\u003c\/li\u003e\n\u003cli\u003e443 liters per hour at 7,000 engine rpm with a 7.85 mm fuel lobe\u003c\/li\u003e\n\u003cli\u003eRecommended fuel-lobe lift: 7.85 mm\u003c\/li\u003e\n\u003cli\u003eMaximum tested fuel-lobe lift: 8.2 mm\u003c\/li\u003e\n\u003cli\u003eEngine-speed capability up to 8,000 rpm\u003c\/li\u003e\n\u003cli\u003eCompatible with production LT1 and LT4 pump lobes and properly configured aftermarket high-lift lobes\u003c\/li\u003e\n\u003cli\u003eImproved inlet orientation for LT2 packaging\u003c\/li\u003e\n\u003cli\u003eOptimized discharge passages for increased high-rpm and WOT efficiency\u003c\/li\u003e\n\u003cli\u003e100% tested for performance and functionality\u003c\/li\u003e\n\u003cli\u003eCompatible with gasoline, E10 through E85 and M15\u003c\/li\u003e\n\u003cli\u003eDesigned for naturally aspirated, supercharged and turbocharged combinations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePressure and Supply Requirements\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eRecommended operating pressure: up to 250 bar \/ 3,600 psi\u003c\/li\u003e\n\u003cli\u003eLow-side fuel pressure of at least 70 psi is required to achieve maximum output\u003c\/li\u003e\n\u003cli\u003eThe complete system must be sized correctly, including low-side pump capacity, injectors, commanded rail pressure and calibration\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCritical Installation Requirements\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eThis pump is not a simple bolt-on-and-go installation.\u003c\/strong\u003e Correct installed height and plunger preload must be measured and verified before final installation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eRequired installed plunger preload: \u003cstrong\u003e1.20-1.80 mm \/ .047-.070 inch\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRecommended lobe lift: 7.85 mm; maximum tested lift: 8.2 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo not use a lash cap.\u003c\/strong\u003e Stanadyne specifically prohibits lash-cap installation because immediate pump and\/or engine failure may occur.\u003c\/li\u003e\n\u003cli\u003eIf preload is too high, additional .012-inch \/ 0.3 mm gaskets are used to reduce preload\u003c\/li\u003e\n\u003cli\u003eIf preload is too low, the pump flange may require professional machining to achieve the required range\u003c\/li\u003e\n\u003cli\u003eApply blue threadlocker and torque the pump bolts evenly to 25 Nm \/ 18 ft-lb\u003c\/li\u003e\n\u003cli\u003eDo not allow the plunger to bottom out\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWrong preload can cause pump failure, loss of plunger-to-lifter contact at high rpm or internal piston contact.\u003c\/strong\u003e Installation measurements must be submitted through Stanadyne's RGX installation-validation portal to register the pump and support any future warranty consideration.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.stanadyne.com\/rgx-installation-validation\/\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOpen Stanadyne RGX Installation Validation and Product Registration\u003c\/a\u003e\u003c\/p\u003e\u003ch3\u003eTechnical Documents\u003c\/h3\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0760\/2041\/6831\/files\/Stanadyne-RGX-Technical-Details_dd9cb2e5-0ee1-40ea-ba98-d1d3f0201ddd.png?v=1784666848\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOpen RGX Technical Details in a New Tab\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0760\/2041\/6831\/files\/Stanadyne-RGX-Preload-Requirements_233c06bd-65d4-45d8-9c7a-2c47dca8c088.png?v=1784666847\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOpen RGX Preload Requirements in a New Tab\u003c\/a\u003e\u003c\/p\u003e\u003ch3\u003eProfessional Installation Strongly Recommended\u003c\/h3\u003e\u003cp\u003eFuel-system capability, injector capacity, camshaft fuel-lobe geometry, rail-pressure strategy and tuning must be evaluated as a complete package. SMG Speed Shop and North Texas High Performance can supply and install the supporting low-side system, injectors and calibration components required for a properly engineered GM LTx fuel system.\u003c\/p\u003e","brand":"Stanadyne","offers":[{"title":"Default Title","offer_id":54142845780287,"sku":"06728","price":2400.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0760\/2041\/6831\/files\/AEJ_6961.jpg?v=1784666322","url":"https:\/\/smgspeed.com\/products\/stanadyne-rgx-12mm-high-pressure-fuel-pump-for-gm-ltx","provider":"SMGspeed","version":"1.0","type":"link"}