{"product_id":"smg-big-boy-drop-in-fuel-pump-for-14-silverado-sierra","title":"SMG \"Big Boy\" Drop-in Fuel Pump for 14+ Silverado\/Sierra","description":"\u003ch2\u003eSMG “Big Boy” Drop-In Low-Side Fuel Pump Module\u003c\/h2\u003e\n\u003cp\u003eThe factory low-side fuel system can become the restriction long before a properly built Gen V truck combination reaches its potential. The SMG Big Boy was developed to bridge the gap between the stock module and a full auxiliary or standalone fuel system while preserving an OEM-style installation.\u003c\/p\u003e\n\u003cp\u003eEach module begins with an original-equipment-style pump assembly and is upgraded in-house with a high-output Walbro 535 pump, reinforced internal wiring and factory-style pressure regulation. The completed assembly drops into the tank without cutting the tank, splicing the vehicle harness or replacing the factory supply line.\u003c\/p\u003e\n\u003ch3\u003eWhy the Big Boy Works\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-output genuine Walbro 535 “Hellcat” fuel pump\u003c\/li\u003e\n\u003cli\u003eModified OEM-style fuel-pump module for factory-like fit\u003c\/li\u003e\n\u003cli\u003eUpgraded internal wiring for high-current reliability\u003c\/li\u003e\n\u003cli\u003eNo tank cutting, external sump or vehicle-harness splicing\u003c\/li\u003e\n\u003cli\u003eCompatible with pump gasoline and ethanol fuels, including E85\u003c\/li\u003e\n\u003cli\u003eHand-built and function-tested by SMG before shipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProven Fueling Capacity\u003c\/h3\u003e\n\u003cp\u003eThe Big Boy has been tested in a Silverado\/Sierra platform supporting more than \u003cstrong\u003e750 wheel horsepower on E85\u003c\/strong\u003e with stock LT4 injectors, an LT4 high-pressure fuel pump and a 32% cam fuel lobe. That result reflects one complete vehicle combination; actual capacity depends on commanded pressure, fuel type, injector and high-pressure-pump capability, tuning, boost and the rest of the fuel system.\u003c\/p\u003e\n\u003cp\u003eThe module is also a strong foundation for customers planning to add an SMG auxiliary fuel system later. The drop-in pump handles the OEM-style primary supply while the aux system adds capacity for more demanding builds.\u003c\/p\u003e\n\u003ch3\u003eVehicle Fitment\u003c\/h3\u003e\n\u003cp\u003eDesigned for \u003cstrong\u003e2014–2018 Chevrolet Silverado 1500 and GMC Sierra 1500 V8 models\u003c\/strong\u003e. Some early-2019 trucks use the previous-generation tank and module design and may also fit. Confirm that the truck is the legacy-body configuration before ordering for 2019.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSelect the correct cab\/bed configuration:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExtended Cab \/ Crew Cab\u003c\/li\u003e\n\u003cli\u003eStandard Cab Long Bed\u003c\/li\u003e\n\u003cli\u003eStandard Cab Short Bed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCab and bed selection matters because GM used different module and tank configurations. Do not choose solely by model year.\u003c\/p\u003e\n\u003ch3\u003eWhat to Expect During Installation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRemove the original in-tank pump module\u003c\/li\u003e\n\u003cli\u003eTransfer the existing fuel-level sender when the selected module does not include a new sender\u003c\/li\u003e\n\u003cli\u003eInstall the Big Boy module in the factory location\u003c\/li\u003e\n\u003cli\u003eReconnect the factory wiring and fuel supply connection\u003c\/li\u003e\n\u003cli\u003eUpdate the calibration for the new pump’s pressure and volume capability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe module can operate on a stock calibration, but professional tuning is strongly recommended to obtain the intended performance and maintain stable fuel pressure.\u003c\/p\u003e\n\u003ch3\u003eTuning and Operating Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReview desired pressure, maximum pressure, pump duty-cycle, FSCM and ECM fuel-pressure tables\u003c\/li\u003e\n\u003cli\u003eGM-style regulators commonly begin bypassing near 5 bar, approximately 72 psi\u003c\/li\u003e\n\u003cli\u003eMany high-output combinations perform well with commanded low-side pressure in the 50–60 psi range\u003c\/li\u003e\n\u003cli\u003eAvoid performance driving below one-quarter tank; high pump volume can outpace saddle-tank transfer under sustained demand\u003c\/li\u003e\n\u003cli\u003eWork with a qualified tuner familiar with Gen V GM truck fuel-system control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFuel Compatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eApproved for pump gasoline and ethanol-based fuels, including E85\u003c\/li\u003e\n\u003cli\u003eNot approved for methanol, aggressive race-fuel additives or other fuels not compatible with the module’s internal seals\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBuild Quality, Lead Time and Warranty\u003c\/h3\u003e\n\u003cp\u003eEach Big Boy module is assembled and tested in Texas. This is a made-to-order product; allow approximately \u003cstrong\u003e5–7 business days\u003c\/strong\u003e for assembly before shipment. The shipping method selected at checkout affects transit time after the module is completed.\u003c\/p\u003e\n\u003cp\u003eThe original purchaser receives a \u003cstrong\u003e90-day limited warranty\u003c\/strong\u003e against manufacturing defects. Coverage does not include physical damage, improper installation, tuning errors or damage caused by unapproved fuels. The module must be returned to SMG for inspection before warranty authorization.\u003c\/p\u003e\n\u003ch3\u003eRecommended Supporting Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSMG Silverado\/Sierra Flex Fuel Kit\u003c\/li\u003e\n\u003cli\u003eSMG Truck\/SUV Auxiliary Fuel System\u003c\/li\u003e\n\u003cli\u003eLT4 injectors and high-pressure fuel-pump upgrades for compatible applications\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SMGspeed","offers":[{"title":"Extended Cab\/Crew Cab","offer_id":45904652304444,"sku":"SMGTRUCKBIGBOY-CREW","price":692.99,"currency_code":"USD","in_stock":true},{"title":"Standard Cab Long Bed","offer_id":45904652337212,"sku":"SMGTRUCKBIGBOY-STDLB","price":692.99,"currency_code":"USD","in_stock":true},{"title":"Standard Cab Short Bed","offer_id":45904652369980,"sku":"SMGTRUCKBIGBOY-STDSB","price":692.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/5934\/4956\/files\/s-l1200_db031999-3a6d-41c0-b335-a37fac9bf89e.jpg?v=1784558994","url":"https:\/\/rpm-racing.com\/products\/smg-big-boy-drop-in-fuel-pump-for-14-silverado-sierra","provider":"Racing Precision Motorsports","version":"1.0","type":"link"}