{"product_id":"holley-12-804-chrome-carbureted-fuel-pressure-regulator-adjustable","title":"Holley 12-804 Chrome Carbureted Fuel Pressure Regulator - Adjustable","description":"\u003cp\u003eIn this review the Holley 12-804 Chrome Carbureted Fuel Pressure Regulator is judged on fit, finish and operating control for carbureted engines. It is best for owners running traditional carburetors like Weber 32\/36 setups who need a simple, adjustable way to keep pump pressure in check; the single biggest reason to buy is the precise, factory-preset baseline and straightforward adjustment that make dialing in pressure quick. The review looks at build quality, ports and installation to help decide if it suits a restoration or performance street build.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable pressure range:\u003c\/strong\u003e The regulator adjusts from 1 to 4 psi so users can match fuel pressure to needle and seat assemblies for reliable carburetor operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory preset:\u003c\/strong\u003e Pre-set at 2.8 psi at the factory, which gives a sensible starting point and reduces guesswork on first installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-flow restriction:\u003c\/strong\u003e The 220' (7\/32') restriction balances flow and control for typical carbureted applications that require steady fuel delivery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust plumbing:\u003c\/strong\u003e 3\/8' NPT ports with one inlet and two outlets provide straightforward plumbing options and a secure threaded connection to the fuel system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChrome finish and bracket:\u003c\/strong\u003e The chrome finish provides a tidy appearance for show or restored engines, and the included mounting bracket simplifies securing the regulator.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe Holley 12-804 is aimed at classic car and hot rod owners running carburetors who need a simple, adjustable regulator with a clean appearance; it is particularly popular with users of Weber 32\/36 carburetors who value ease of adjustment and a solid build. Mechanics and hobbyists who want a regulator that arrives with a sensible factory setting and uses common 3\/8' NPT plumbing will find it convenient.\u003c\/p\u003e\n\u003cp\u003eIt is less suitable for systems that require pressures outside the 1 to 4 psi window or for installations that need threaded mounting holes without modification. Buyers who must guarantee ultra-precise regulation under all operating conditions should verify compatibility with their specific carburetor and needle\/seat combination before purchase.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSolid build quality and a clean chrome finish that enhances engine-bay appearance.\u003c\/li\u003e\n\u003cli\u003eEasy to adjust and arrives pre-set at a useful 2.8 psi for quick initial setup.\u003c\/li\u003e\n\u003cli\u003e3\/8' NPT in\/out ports and two outlets offer flexible plumbing for common carbureted systems.\u003c\/li\u003e\n\u003cli\u003eIncludes a mounting bracket for straightforward installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome users report mixed results with pressure regulation under certain setups, so verification with the target carburetor is advised.\u003c\/li\u003e\n\u003cli\u003eThe mounting holes are not threaded, which can require additional hardware or modification to secure cleanly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHolley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e12-804\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePressure range\u003c\/td\u003e\n\u003ctd\u003eAdjustable 1 to 4 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFactory preset\u003c\/td\u003e\n\u003ctd\u003e2.8 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRestriction size\u003c\/td\u003e\n\u003ctd\u003e220' (7\/32')\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePorts\u003c\/td\u003e\n\u003ctd\u003e3\/8' NPT (1 inlet, 2 outlets)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eChrome; mounting bracket included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Holley 12-804 is a practical, well-built regulator for carbureted engines that need a modest, adjustable pressure window and a tidy chrome appearance. It represents good value for restorations and street builds where ease of adjustment and common 3\/8' NPT plumbing matter, though installers should be aware of reported variability in regulation for some setups and the unthreaded mounting holes.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs the regulator ready to use out of the box?\u003c\/strong\u003e\u003cbr\u003eYes, it is pre-set at 2.8 psi from the factory so it can be installed and fine-tuned immediately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat fittings are required?\u003c\/strong\u003e\u003cbr\u003eThe unit uses 3\/8' NPT ports; one inlet and two outlets accept standard 3\/8' NPT fittings or adapters for common fuel lines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it work with Weber 32\/36 carburetors?\u003c\/strong\u003e\u003cbr\u003eMany users report good results with Weber 32\/36 carburetors, but some have seen mixed regulation performance, so confirm compatibility with your needle and seat and test under real operating conditions.\u003c\/p\u003e","brand":"Holley","offers":[{"title":"Default Title","offer_id":48260291494107,"sku":"B00029JC6M","price":56.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61atTKC0kRL._AC_SL1500.jpg?v=1776600014","url":"https:\/\/gearmusthave.com\/products\/holley-12-804-chrome-carbureted-fuel-pressure-regulator-adjustable","provider":"GearMustHave","version":"1.0","type":"link"}