{"product_id":"electric-fuel-pump-for-omc-volvo-penta-120-psi-replaces-3857650-3855958-988037-sierra-18-7331","title":"Sierra Electric Fuel Pump 18-7331, Low Pressure, GM Mark V 454\/7.4L \u0026 502\/8.2L (HU-WT) Engines","description":"\u003cp\u003eThe Sierra 18-7331 is a low-pressure electric fuel pump built for GM Mark V 454\/7.4L and 502\/8.2L (HU-WT) marine engines. It delivers a 45 GPM flow rate at 8 PSI, matching the output of the original low-pressure fuel pump these engines were designed around. The pump body is constructed of metal alloy with plastic and rubber components for the seals and fittings, giving it the durability needed for continuous marine fuel system duty while keeping weight low at 1.35 pounds.\u003c\/p\u003e\u003cp\u003eFuel connections are threaded: a 5\/8 inch-18 inlet fitting and a 3\/8 inch-24 outlet fitting, both designed for a secure, leak-resistant seal in gasoline fuel systems. The pump uses a tank-mount configuration and is designed as a direct replacement for the factory low-pressure pump on applicable GM Mark V big-block engines, restoring correct fuel delivery pressure and volume without modification to the existing fuel lines or mounting hardware.\u003c\/p\u003e\u003cp\u003eThis is a low-pressure pump only -- it is not designed for high-pressure MPI fuel injection applications. Confirm your engine's low-pressure fuel pump requirement and the OEM part number it replaces before ordering.\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 18-7331\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Electric Fuel Pump\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure:\u003c\/strong\u003e 8 PSI (Low Pressure)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow Rate:\u003c\/strong\u003e 45 GPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Connection:\u003c\/strong\u003e 5\/8 inch-18, threaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutlet Connection:\u003c\/strong\u003e 3\/8 inch-24, threaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Tank Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Gasoline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal Alloy, Plastic, Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.35 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282112387\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1994-99 454\/7.4L \u0026amp; 502\/8.2L (HU-WT) GM Mark V engines, low pressure\u003c\/li\u003e\n\u003cli\u003e1992-93 454\/7.4L GM Mark V engines, low pressure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e3858714\u003c\/li\u003e\n\u003cli\u003e3850810\u003c\/li\u003e\n\u003cli\u003e3857985\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-7331 fuel pump fit?\u003c\/strong\u003e The Sierra 18-7331 fits 1994-99 GM Mark V 454\/7.4L and 502\/8.2L (HU-WT) engines as well as 1992-93 GM Mark V 454\/7.4L engines, and is designed for the low-pressure fuel pump position on these applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-7331 a high-pressure or low-pressure fuel pump?\u003c\/strong\u003e It is a low-pressure fuel pump rated at 8 PSI, not a high-pressure pump for MPI fuel injection systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the flow rate of this fuel pump?\u003c\/strong\u003e The Sierra 18-7331 delivers 45 GPM at 8 PSI.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-7331 replace?\u003c\/strong\u003e It replaces OEM part numbers 3858714, 3850810, and 3857985 on applicable GM Mark V low-pressure fuel pump applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size are the inlet and outlet fittings?\u003c\/strong\u003e The inlet fitting is 5\/8 inch-18 threaded and the outlet fitting is 3\/8 inch-24 threaded on the 18-7331 fuel pump.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the pump body made of?\u003c\/strong\u003e The 18-7331 pump body is metal alloy with plastic and rubber components used for seals and fittings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-7331 fuel pump weigh?\u003c\/strong\u003e This Sierra fuel pump weighs 1.35 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-7331 mounted?\u003c\/strong\u003e It uses a tank-mount configuration, matching the original equipment mounting arrangement on these GM Mark V engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat fuel type is this pump designed for?\u003c\/strong\u003e The Sierra 18-7331 is designed for use with gasoline fuel systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions of the 18-7331?\u003c\/strong\u003e The pump measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-7331 work on a high-pressure MPI fuel-injected engine?\u003c\/strong\u003e No, the 18-7331 is a low-pressure pump and is not intended for high-pressure MPI applications; confirm your engine uses a low-pressure fuel pump before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-7331 come as a complete assembly?\u003c\/strong\u003e Yes, the Sierra 18-7331 ships as a complete electric fuel pump assembly ready to install in the low-pressure fuel pump position.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988383772891,"sku":"SIE-18-7331","price":219.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__99576.1753840687.500.750.jpg?v=1785188478","url":"https:\/\/www.goodvibesmarina.com\/products\/electric-fuel-pump-for-omc-volvo-penta-120-psi-replaces-3857650-3855958-988037-sierra-18-7331","provider":"Good Vibes Marina","version":"1.0","type":"link"}