{"product_id":"sierra-18-7789-fuel-water-separating-filter","title":"Sierra 18-7789 Fuel\/Water Separating Filter | 21 Micron | Volvo Penta OMC","description":"\u003ch2\u003eSierra 18-7789 Fuel\/Water Separating Filter\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 18-7789\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOfficial Product Type:\u003c\/strong\u003e Spin-on Fuel\/Water Separating Filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFiltration Rating:\u003c\/strong\u003e 21 micron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 13\/16-18\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282244811\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e Volvo Penta 3851218, 3852413, 3862228 — confirm by engine model and serial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaced By:\u003c\/strong\u003e No confirmed supersession — 18-7789 is current Sierra catalog\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Gasoline marine fuel\/water separation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService Interval:\u003c\/strong\u003e Annually or per engine manufacturer’s maintenance schedule; sooner after contaminated fuel exposure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat This Filter Does\u003c\/h2\u003e\n\u003cp\u003eThe Sierra 18-7789 is a 21-micron spin-on fuel\/water separating filter for compatible gasoline marine fuel systems. It removes separated water and fine particulate contamination from the fuel supply before it reaches the engine. The epoxy-coated canister is built for marine bilge and engine-room environments.\u003c\/p\u003e\n\u003cp\u003eThis is a \u003cstrong\u003ereplacement spin-on filter element only\u003c\/strong\u003e — it does not include the filter head, mounting bracket, fittings, hoses, or separator assembly.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVolvo Penta SX \/ EFI gasoline sterndrive applications\u003c\/li\u003e\n\u003cli\u003eOMC Cobra EFI sterndrive applications\u003c\/li\u003e\n\u003cli\u003eCompatible fuel\/water separator heads with \u003cstrong\u003e13\/16-18 thread\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEthanol-blended marine gasoline systems requiring water separation and particulate filtration\u003c\/li\u003e\n\u003cli\u003eFuel\/water separator assemblies specifying \u003cstrong\u003eSierra 18-7789\u003c\/strong\u003e or a verified OEM equivalent\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eConfirm the existing filter number, filter-head thread, gasket diameter, and fuel type before ordering. Do not select by engine brand alone.\u003c\/p\u003e\n\n\u003ch2\u003eOEM Cross-Reference Numbers\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eVolvo Penta:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e3851218\u003c\/li\u003e\n\u003cli\u003e3852413\u003c\/li\u003e\n\u003cli\u003e3862228\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eJohnson \/ Evinrude \/ OMC:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e5009676\u003c\/li\u003e\n\u003cli\u003e5011090\u003c\/li\u003e\n\u003cli\u003e502906\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen to Replace This Filter\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAnnual seasonal service or per engine manufacturer’s maintenance schedule\u003c\/li\u003e\n\u003cli\u003eWater contamination found in the fuel system\u003c\/li\u003e\n\u003cli\u003eEngine shows signs of fuel restriction: hard starting, rough idle, hesitation, surging, power loss, or stalling under load\u003c\/li\u003e\n\u003cli\u003eVisible rust, damage, or leaks on the existing canister\u003c\/li\u003e\n\u003cli\u003eAfter any contaminated fuel exposure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf significant water is found in the removed filter, inspect the fuel tank and supply before returning the engine to service.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eShut off the fuel supply before servicing\u003c\/li\u003e\n\u003cli\u003ePlace absorbent material under the filter before removal\u003c\/li\u003e\n\u003cli\u003eConfirm the old gasket is not stuck to the filter head — remove it if so\u003c\/li\u003e\n\u003cli\u003eClean the sealing surface on the filter head\u003c\/li\u003e\n\u003cli\u003eLightly lubricate the new gasket with clean fuel or engine oil\u003c\/li\u003e\n\u003cli\u003eInstall hand-tight per filter instructions — do not overtighten\u003c\/li\u003e\n\u003cli\u003ePrime the fuel system and check for leaks after startup\u003c\/li\u003e\n\u003cli\u003eDispose of used filter and contaminated fuel per local environmental requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs 21 micron the same as 20 micron?\u003c\/strong\u003e\u003cbr\u003eNo. Sierra rates 18-7789 at \u003cstrong\u003e21 micron\u003c\/strong\u003e. Some aftermarket equivalents are marketed at 20 micron. Use the Sierra specification when matching this filter to a service requirement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes thread size confirm fitment?\u003c\/strong\u003e\u003cbr\u003eThread size (13\/16-18) is a necessary match but not sufficient on its own. Confirm the OEM cross-reference or existing filter number as well, as similar thread filters can differ in micron rating, gasket diameter, and canister dimensions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVolvo Penta 3862228 — which engines?\u003c\/strong\u003e\u003cbr\u003eVolvo Penta’s maintenance catalog lists 3862228 across selected 4.3L, 5.0L, 5.7L, 7.4L, and 8.1L gasoline engine families. Confirm by engine model and serial number.\u003c\/p\u003e\n\n\u003ch2\u003eRelated Parts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131496738852\"\u003eVolvo Penta 3847644 Fuel Filter \/ Water Separator – 6 Micron\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11095420108836\"\u003eSeachoice 50-20938 Fuel\/Water Separating Filter – Volvo\/OMC – 10 Micron\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11095420076068\"\u003eSeachoice 50-20937 Fuel\/Water Separating Filter – 10 Micron\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003eThe most reliable way to match this filter is by \u003cstrong\u003eboth the OEM filter number and the 13\/16-18 filter-head thread\u003c\/strong\u003e. Its strongest verified applications are Volvo Penta SX\/EFI and OMC Cobra EFI systems. A common issue is customers ordering by engine brand alone without confirming the filter-head thread or existing part number — this leads to fitment mismatches even on correct engine families. If water is found in the removed filter, always trace it back to the fuel supply before putting the boat back in service.\u003c\/p\u003e","brand":"WEST","offers":[{"title":"Default Title","offer_id":43564265734180,"sku":"SIE-18-7789","price":18.09,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/be522162-6a3c-4ff4-86fd-fcd18e785dd1_1.png?v=1788741214","url":"https:\/\/marisolmarine.com\/products\/sierra-18-7789-fuel-water-separating-filter","provider":"Marisol Marine Company","version":"1.0","type":"link"}