{"product_id":"marine-fuel-filter-for-mercury-mercruiser-35-807172-21-micron-90-gph-sierra-18-7844","title":"Sierra 18-7844 Fuel Filter, Short 3.875 Inch, 21 Micron, Replaces Mercury 35-807172","description":"\u003cp\u003eThe Sierra 18-7844 is a 21 micron fuel filter built in the short, 3.875 inch length to fit engines that call for the compact filter body. Ethanol-blended fuel absorbs more water and loosens more particulate than non-ethanol fuel, so proper filtration ahead of the carburetor or injectors is essential to protect the fuel system on any horsepower of engine. This filter is rated to flow 90 gallons per hour, giving even high-demand motors an unrestricted supply of clean fuel while trapping water and debris before they reach the engine.\u003c\/p\u003e\u003cp\u003eThe filter housing is built with a plastic outer body and is designed as a direct replacement for the Mercury Marine 35-807172 filter. It is a straightforward drop-in service part: remove the old canister-style filter and thread on the Sierra 18-7844 in its place. Keeping fuel filtration current is one of the simplest ways to prevent hard starting, rough running, and fuel-related damage caused by water contamination or loosened ethanol deposits.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-7844\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Length:\u003c\/strong\u003e Short - 3.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFiltration Rating:\u003c\/strong\u003e 21 Micron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow Rate:\u003c\/strong\u003e 90 gallons per hour\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Material:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.98 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVehicle Service Type:\u003c\/strong\u003e Personal Watercraft\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e Mercury Marine 35-807172, Mercury Marine 35-802893Q\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applications using the short, 3.875 inch 21 micron canister-style fuel filter, including personal watercraft applications specified by the OEM cross-reference numbers below.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 35-807172\u003c\/li\u003e\n\u003cli\u003eMercury Marine 35-802893Q\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-7844 fuel filter replace?\u003c\/strong\u003e The Sierra 18-7844 is a direct replacement for the Mercury Marine 35-807172 and Mercury Marine 35-802893Q fuel filters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat micron rating is this filter?\u003c\/strong\u003e The Sierra 18-7844 is rated at 21 microns, which traps water and particulate loosened by ethanol-blended fuel before it reaches the engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow long is the Sierra 18-7844 filter?\u003c\/strong\u003e It is the short-length version at 3.875 inches, as opposed to the long 4.35 inch version sold under a different part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat flow rate does this filter support?\u003c\/strong\u003e The Sierra 18-7844 flows at 90 gallons per hour, which is sufficient to feed high-horsepower engines without restricting fuel delivery.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the filter housing made of?\u003c\/strong\u003e The Sierra 18-7844 has a plastic outer housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-7844 weigh?\u003c\/strong\u003e This filter weighs 0.98 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-7844 a genuine Mercury part or an aftermarket replacement?\u003c\/strong\u003e The 18-7844 is a Sierra-manufactured aftermarket filter engineered to replace the Mercury Marine 35-807172 and 35-802893Q filters with equivalent filtration and flow performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does ethanol-blended fuel need extra filtration?\u003c\/strong\u003e Ethanol-blended fuel absorbs more water and loosens more particulate than non-ethanol fuel, which is why a properly rated filter like the 21 micron Sierra 18-7844 is important for protecting the fuel system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many filters come in the package?\u003c\/strong\u003e The Sierra 18-7844 is sold as a single fuel filter, one unit count per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-7844 and the 18-7845?\u003c\/strong\u003e The 18-7844 is the short 3.875 inch version, while the 18-7845 is the long 4.35 inch version of the same 21 micron filter line; be sure to order the length that matches your existing filter housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of engines is the Sierra 18-7844 designed for?\u003c\/strong\u003e This filter is designed for use with personal watercraft and other engines that use the short, 3.875 inch 21 micron canister-style fuel filter, including applications originally fitted with the Mercury Marine 35-807172.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988389376219,"sku":"SIE-18-7844","price":11.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__19884.1753840688.500.750.jpg?v=1785188197","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-fuel-filter-for-mercury-mercruiser-35-807172-21-micron-90-gph-sierra-18-7844","provider":"Good Vibes Marina","version":"1.0","type":"link"}