{"product_id":"sierra-fuel-filter-18-7846-medium-21-micron-1-12-thread-universal-replacement","title":"Sierra Fuel Filter 18-7846 — Medium 21-Micron, 1\"-12 Thread Universal Replacement","description":"\u003cp\u003e\u003cstrong\u003eThe Sierra International 18-7846 Medium Fuel Filter is a 21-micron, 1\"-12 threaded replacement designed to match common OEM marine and automotive fuel filters for reliable contamination control.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement fuel filter from Sierra fits a wide range of engines and fuel systems where a medium 21-micron filtration rating is specified. Built as a universal-fit unit, it is compatible with several OEM part numbers — including Crusader 98041 and OMC 502905 — offering a straightforward swap for maintenance and repair jobs. The part is covered by Sierra's customer satisfaction warranty, giving installers and boat owners added confidence when servicing fuel systems.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this filter match OEM specifications?\u003c\/h3\u003e\n\u003cp\u003eThe 18-7846 is engineered to replicate critical dimensions and thread pitch for direct compatibility with many original equipment applications. It uses a 1\"-12 thread pitch and a 21-micron media rating to meet the same basic filtration and fastening requirements as the referenced factory parts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacements: Crusader 98041, OMC 502905, OMC 174144\u003c\/li\u003e\n  \u003cli\u003eEquivalent OEM numbers: Volvo 3851218-2\u003c\/li\u003e\n  \u003cli\u003eThread pitch: 1\"-12 for secure mounting\u003c\/li\u003e\n  \u003cli\u003eFiltration rating: 21 micron for medium contaminant capture\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key technical features I should know?\u003c\/h3\u003e\n\u003cp\u003eThis medium fuel filter combines a defined particle rating with standard mechanical fittings so it can be installed without modifying the fuel system. The construction and materials are selected for typical marine and automotive operating environments.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFilter rating: 21 micron to trap medium-sized particles\u003c\/li\u003e\n  \u003cli\u003eThread pitch: 1\"-12 to match common housings and adapters\u003c\/li\u003e\n  \u003cli\u003eFit type: Universal fit for flexible application across models\u003c\/li\u003e\n  \u003cli\u003eWarranty: Covered under Sierra's customer satisfaction policy\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen should I choose a 21-micron filter like this?\u003c\/h3\u003e\n\u003cp\u003eChoose this medium-grade filter when the manufacturer's service specifications call for 21-micron filtration or when replacing the listed OEM part numbers. It balances contaminant protection with fuel flow, making it suitable for routine maintenance intervals on many gasoline and diesel systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIdeal for scheduled filter replacements that cite 21 micron\u003c\/li\u003e\n  \u003cli\u003eAppropriate when replacing listed OEM numbers to maintain system specs\u003c\/li\u003e\n  \u003cli\u003eUseful where moderate particulate removal is needed without excessive flow restriction\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Sierra 18-7846 is intended for boat owners, mechanics, and fleet service technicians who need a reliable, direct-fit replacement for mid-grade fuel filtration. It’s well suited to those servicing older or mixed-brand marine engines and vehicles that list Crusader 98041, OMC 502905\/174144, or Volvo 3851218-2 as compatible parts. If you require a sturdy, warranty-backed medium filtration element with a standard 1\"-12 thread, this filter offers a practical and cost-effective option for routine maintenance and repairs.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this replace OMC 502905?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The Sierra 18-7846 is a compatible replacement for OMC 502905 and similar OEM numbers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is the filtration rating and thread size?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It has a 21-micron rating and a 1\"-12 thread pitch for standard fittings.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48084362068126,"sku":"B0001CLG32","price":28.23,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/sierra-18-7846-front-view.jpg?v=1785851668","url":"https:\/\/northtrailauto.ca\/products\/sierra-fuel-filter-18-7846-medium-21-micron-1-12-thread-universal-replacement","provider":"North Trail Auto","version":"1.0","type":"link"}