{"product_id":"spool-performance-split-fuel-surge-tank","title":"Spool Performance Split Fuel Surge Tank","description":"\u003cp\u003eHigh-horsepower engines don’t just need more fuel — they need \u003cstrong\u003estable, predictable fuel control\u003c\/strong\u003e. The \u003cstrong\u003eSpool Performance Split Fuel Surge Tank\u003c\/strong\u003e was designed specifically to solve the real problems that show up when direct injection and port injection are pushed hard.\u003c\/p\u003e\n\u003cp\u003eAt high load, the factory high-pressure fuel pump for \u003cstrong\u003edirect injection\u003c\/strong\u003e creates rapid \u003cstrong\u003epressure pulses\u003c\/strong\u003e on the low-pressure side of the system. When DI and PI share the same fuel supply, those pulses can travel through the fuel rail and cause \u003cstrong\u003eunstable pressure at the port injectors\u003c\/strong\u003e, leading to inconsistent injector flow and tuning headaches. This is one of the most common causes of erratic PI behavior on high-power builds.\u003c\/p\u003e\n\u003cp\u003eOur split surge tank \u003cstrong\u003ephysically isolates the DI and PI fuel circuits\u003c\/strong\u003e. One dedicated pump feeds the DI system, while up to \u003cstrong\u003ethree pumps supply the port injection system\u003c\/strong\u003e, keeping pressure smooth and consistent where it matters most. The result is \u003cstrong\u003estable PI fueling, cleaner injector control, and far more predictable tuning\u003c\/strong\u003e, even under heavy boost.\u003c\/p\u003e\n\u003cp\u003eThe separate PI circuit also allows you to \u003cstrong\u003eproperly boost-reference the port injection system\u003c\/strong\u003e, maintaining consistent injector differential pressure as boost rises. This keeps PI injector flow linear, improves safety at high load, and gives tuners precise control over fueling across the entire RPM and boost range.\u003c\/p\u003e\n\u003cp\u003eMachined from \u003cstrong\u003ebillet 6061 aluminum\u003c\/strong\u003e, the surge tank is built for durability and long-term reliability in high-ethanol and high-horsepower environments. Installation is handled with a \u003cstrong\u003etrue plug-and-play wiring harness\u003c\/strong\u003e, running \u003cstrong\u003efrom the battery all the way to the fuel pumps\u003c\/strong\u003e, complete with properly sized \u003cstrong\u003erelays and fuses\u003c\/strong\u003e — no custom wiring, no shortcuts.\u003c\/p\u003e\n\u003ch3\u003eKey Highlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned specifically for \u003cstrong\u003ehigh-horsepower DI + PI setups\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBillet 6061 aluminum construction\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSupports \u003cstrong\u003eup to 4 fuel pumps\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e1 dedicated pump for \u003cstrong\u003eDirect Injection\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUp to 3 pumps for \u003cstrong\u003ePort Injection\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIsolated DI and PI fuel circuits\u003c\/strong\u003e to eliminate pressure pulse interference\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnables \u003cstrong\u003eboost-referenced port injection\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eComplete plug-and-play harness\u003c\/strong\u003e from battery to pumps, including relays and fuses\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNOTE: Fuel Pumps Not Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis is fuel system architecture done the right way — stable, scalable, and built for serious power.\u003c\/p\u003e","brand":"Spool Performance","offers":[{"title":"Yes Include DI and PI regulators","offer_id":47878175948956,"sku":"SP-UST-4-2","price":1499.0,"currency_code":"USD","in_stock":true},{"title":"No I will use my own regulators","offer_id":47878175981724,"sku":"SP-UST-4-0","price":1199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0473\/3206\/5436\/files\/1_3eac0320-b9eb-4fec-bb34-f1a69e492e3f.png?v=1791771245","url":"https:\/\/daroracing.com\/products\/spool-performance-split-fuel-surge-tank","provider":"Daro Racing","version":"1.0","type":"link"}