Sierra 18-8004EP-1 8004EP1 Primer Bulb, 5/16"
Sierra 18-8004EP-1 8004EP1 Primer Bulb, 5/16" — Product description
Upgrade your outboard or marine engine's fuel delivery system with a reliable primer bulb designed for seamless performance on the water. This 5/16-inch primer bulb delivers the classic feel of traditional designs while incorporating modern engineering to handle today's fuel blends and environmental demands.
Key Features That Stand Out
- Low-Permeation Design: Engineered to meet stringent EPA standards, minimizing fuel evaporation and reducing harmful emissions for a cleaner boating experience.
- Enhanced Durability: Built with superior resistance against UV rays, ozone exposure, and alcohol-infused fuels like E10 or E15, ensuring it withstands harsh marine conditions season after season.
- Reliable Check Valve: Features a stainless steel spring and Viton balls that prevent sticking, providing consistent priming even after long periods of storage.
- Perfect Fit and Feel: Matches the size and squeeze of older bulbs, making it a straightforward replacement without altering your setup.
Why This Primer Bulb Excels in Real-World Use
Boat owners know the frustration of a faulty primer bulb—leaks, hard starts, or fuel vapor lock on those crisp morning outings. This bulb tackles those issues head-on. Its low-permeation material keeps fuel where it belongs, inside the lines, slashing the risk of stale gas buildup during off-season storage. The robust check valve maintains prime pressure reliably, so your engine fires up quickly whether you're on a lake, river, or coastal run.
Crafted from high-grade materials, it flexes just right for easy hand priming yet holds shape under pressure. No more replacing bulbs every season; this one is built to last through ethanol challenges that plague lesser options. Ideal for small outboards, personal watercraft, or auxiliary engines where dependable fuel flow is non-negotiable.
Simple Swap for Better Performance
Replacing your primer bulb is a quick DIY task. Start by pinching off fuel lines to avoid spills, then cut the old bulb free with a sharp blade. Slide the new 5/16-inch bulb into place, ensuring barbs seat fully for a secure seal. Prime a few times to check for air pockets, and you're back on the water. Pro tip: Inspect surrounding hoses for cracks during replacement to prevent future headaches.
Spotting When You Need a New One
Watch for signs like a bulb that won't firm up after squeezing, visible swelling, or fuel odors around the engine. Proactive replacement keeps your adventures uninterrupted and your engine running efficiently.
What size fuel line does this primer bulb fit?
This primer bulb is designed for 5/16-inch inner diameter fuel lines, a common size in many marine outboard and portable engines.
Does this bulb comply with EPA fuel regulations?
Yes, it fully meets 2011 EPA low-permeation requirements, helping reduce fuel vapor emissions for environmentally responsible operation.
How does it resist alcohol-blended fuels?
Specialized materials provide excellent resistance to ethanol and other alcohol additives, preventing degradation common in standard bulbs.
What makes the check valve more reliable?
It uses a stainless steel spring and Viton balls, which resist corrosion and sticking for dependable one-way fuel flow.
Is this bulb suitable for saltwater environments?
Absolutely, its UV, ozone, and chemical resistances make it tough enough for brackish or saltwater boating without premature failure.
Can I use this as a direct replacement for older bulbs?
Yes, it mimics the look, feel, and dimensions of traditional bulbs for an easy drop-in upgrade.
SKU: NVN-4003241
MPN: 18-8004EP-1
UPC: 808282289591
Technical specifications
| Brand | Sierra Engine Parts |
| Model | Sierra 18-8004EP-1 8004EP1 Primer Bulb, 5/16" |
| SKU / MFR# | 4003241 |
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