{"product_id":"sierra-primer-bulb-for-outboards-3-8-large-volume-viton-valves-stainless-springs","title":"Sierra Primer Bulb for Outboards 3\/8\" – Large-Volume Viton Valves, Stainless Springs","description":"\u003cp\u003e\u003cstrong\u003eThe SIERRA INTERNATIONAL 18-8005EP-1 is a large-capacity 3\/8\" primer bulb engineered to restore fuel flow quickly and reliably for outboards and small engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned and molded in-house by Sierra, this primer bulb replaces part 174512 and features double check valves with durable Viton balls and stainless-steel springs. Its 3\/8\" hose connection fits common marine fuel lines, and the generous bulb volume speeds the priming process so engines draw fuel with fewer pulls. Built for longevity and consistent performance, the 18-8005EP-1 focuses on material quality and functional reliability rather than cosmetic frills.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this primer bulb improve starting performance?\u003c\/h3\u003e\n\u003cp\u003eThe larger internal capacity moves more fuel each stroke, reducing the number of pumps needed to get a steady flow. The double check valve arrangement prevents backflow and keeps fuel in the line between starts, which helps maintain a ready-to-start system.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLarge-volume bulb for faster fuel displacement\u003c\/li\u003e\n  \u003cli\u003eDouble check valves minimize backflow for consistent priming\u003c\/li\u003e\n  \u003cli\u003eViton valve balls resist fuel and ethanol breakdown\u003c\/li\u003e\n  \u003cli\u003eStainless steel springs maintain valve tension and durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it fit my boat’s fuel line and replace part 174512?\u003c\/h3\u003e\n\u003cp\u003eThis model is made for 3\/8\" hose connections and is specified as a direct replacement for part number 174512. Confirm your fuel hose inner diameter is 3\/8\" and check routing clearances to ensure the bulb will install without strain or sharp bends.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSpecifically sized for 3\/8\" inner-diameter fuel hoses\u003c\/li\u003e\n  \u003cli\u003eDirect replacement for OEM 174512 designs\u003c\/li\u003e\n  \u003cli\u003eFlexible body accommodates typical marine hose routing\u003c\/li\u003e\n  \u003cli\u003eMolded construction reduces risk of seam leaks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and design features extend its service life?\u003c\/h3\u003e\n\u003cp\u003eSierra molds these bulbs in-house to control material quality and dimensional accuracy. The use of Viton valve balls provides superior resistance to modern fuels and ethanol blends, while stainless steel springs prevent corrosion-related loss of tension.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIn-house molded body for consistent wall thickness and fit\u003c\/li\u003e\n  \u003cli\u003eViton balls resist chemical degradation from fuel blends\u003c\/li\u003e\n  \u003cli\u003eStainless-steel springs avoid rust and maintain spring force\u003c\/li\u003e\n  \u003cli\u003eDouble check valves protect against siphoning and leaks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I install and maintain the primer bulb?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward: cut the fuel line cleanly, push the hose onto the barbed fittings, and secure with appropriate clamps. Periodic inspection for softening, cracking, or fuel smell helps catch wear early; replace the bulb if you detect swelling, hardening, or visible damage.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstall on 3\/8\" hose using clamps over barbs for a secure seal\u003c\/li\u003e\n  \u003cli\u003ePosition bulb away from heat sources and sharp bends\u003c\/li\u003e\n  \u003cli\u003eInspect regularly for cracks, hardening, or leaks\u003c\/li\u003e\n  \u003cli\u003eReplace if performance drops or physical damage appears\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The SIERRA 18-8005EP-1 primer bulb is aimed at boat owners, marine mechanics, and small-engine technicians who need a dependable, ready-to-install replacement for part 174512. It’s a good choice when you want a larger-capacity bulb that reduces pumping effort, uses fuel-resistant components like Viton and stainless steel, and fits standard 3\/8\" fuel lines. Choose this bulb when you prioritize reliable priming, long-term chemical resistance, and straightforward installation for outboard motors and portable engines.\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 bulb fit 3\/8\" fuel hose?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the 18-8005EP-1 is designed for 3\/8\" inner-diameter fuel hoses and replaces part 174512.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What makes the valves durable?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It uses Viton valve balls and stainless-steel springs for superior resistance to fuel and corrosion.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48086164766878,"sku":"B0053HP672","price":48.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/sierra-primer-bulb-closeup.jpg?v=1785887847","url":"https:\/\/northtrailauto.ca\/products\/sierra-primer-bulb-for-outboards-3-8-large-volume-viton-valves-stainless-springs","provider":"North Trail Auto","version":"1.0","type":"link"}