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A cracked or collapsed primer bulb is one of the most common reasons a Yamaha outboard won’t start — and one of the cheapest fixes. These options cover genuine Yamaha OEM replacements sized to your specific hose diameter, plus the marine-aftermarket brands (Sierra, Attwood, Moeller, T-H Marine) that make EPA-compliant universal bulbs fitting Yamaha’s fuel lines.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | Yamaha OEM Primer Bulb 6YK-24360-73-00 | $19-$35 | Amazon · eBay |
| 2 | Yamaha OEM Primer Bulb 6Y1-24360-52 (11mm) | $35-$44 | Amazon · eBay |
| 3 | Sierra 18-8005EP-1 EPA Primer Bulb (3/8″) | $25-$38 | Amazon · eBay |
| 4 | Sierra 18-8004EP-1 EPA Primer Bulb (5/16″) | $25-$38 | Amazon · eBay |
| 5 | Attwood Multi-Layer High-Performance Primer Bulb | $10-$30 | Amazon · eBay |
| 6 | Moeller Low-Perm Marine Primer Bulb | $25-$30 | Amazon · eBay |
| 7 | T-H Marine Universal Gen III Primer Bulb | $29-$32 | Amazon · eBay |
The picks, in detail
Yamaha OEM Primer Bulb 6YK-24360-73-00
The current genuine Yamaha primer bulb part number (superseding the older 6Y2-24360-52-00), sized for 8mm/5⁄16″ fuel line on most portable and mid-range Yamaha outboards.
- Genuine Yamaha OEM part
- 8mm / 5/16″ fuel line fitting
- Direct factory replacement
- Guaranteed exact fit and factory quality
- No guessing on compatibility if your engine matches the part number
- Pricier than aftermarket universal bulbs
- Must confirm exact part number for your engine/hose size before ordering
Yamaha OEM Primer Bulb 6Y1-24360-52 (11mm)
The genuine Yamaha primer bulb for larger 11mm fuel line, used on higher-horsepower Yamaha outboards where the smaller 8mm bulb doesn’t fit.
- Genuine Yamaha OEM part
- 11mm fuel line fitting
- Larger-bore for higher-HP engines
- Correct OEM sizing for bigger Yamaha outboards
- Factory-matched fuel flow rate
- Won’t fit smaller portable Yamaha outboards using 8mm line
- Higher price than universal aftermarket bulbs
Sierra 18-8005EP-1 EPA Primer Bulb (3/8″)
Sierra’s EPA-compliant marine primer bulb sized for 3/8″ fuel hose, a widely-stocked aftermarket alternative to the Yamaha OEM part.
- 3/8″ hose fitting
- EPA/CARB fuel permeation compliant
- Dual internal check valves
- Meets current EPA low-permeation standards
- Widely available at marine retailers
- Universal fit — confirm hose diameter matches your Yamaha before buying
- Not a genuine Yamaha part if warranty matters
Sierra 18-8004EP-1 EPA Primer Bulb (5/16″)
The 5/16″ version of Sierra’s EPA-compliant primer bulb, matching the smaller fuel line size used on many Yamaha portable outboards.
- 5/16″ hose fitting
- EPA/CARB fuel permeation compliant
- Dual internal check valves
- Correct size for smaller Yamaha portables where 8mm Yamaha OEM applies
- Same EPA compliance as the 3/8″ version
- Universal fit — verify hose diameter first
- Not genuine Yamaha branding
Attwood Multi-Layer High-Performance Primer Bulb
Attwood’s three-layer primer bulb construction, built to resist collapsing and hardening over time — sold for 1/4″ and 5/16″ lines and compatible with all OEM brand engines including Yamaha.
- Three-layer construction resists collapse/hardening
- Available in 1/4″ and 5/16″ sizes
- Rated for 18°F to 122°F
- Good durability reputation among the budget-friendly options
- Compatible across OEM brands, not Yamaha-specific
- Universal design, not a Yamaha-branded part
- Lower-end of this price range is a basic model without the multi-layer upgrade
Moeller Low-Perm Marine Primer Bulb
Moeller’s EPA/CARB-compliant low-permeation primer bulb with dual check valves for a fast, reliable prime — sold in 1/4″, 5/16″, and 3/8″ sizes to match Yamaha fuel lines.
- Gasoline/ethanol/solvent-resistant construction
- Stainless steel hose clamps included
- Dual internal check valves
- Meets 2011+ EPA/CARB permeation regulations
- Available in every common Yamaha hose size
- Universal aftermarket part, not Yamaha OEM
- Must match hose size exactly for a proper seal
T-H Marine Universal Gen III Primer Bulb
A universal EPA-approved primer bulb that fits either 3/8″ or 5/16″ fuel line without needing a separate SKU for each size, using T-H Marine’s Speed Prime double check-valve design.
- Fits 3/8″ or 5/16″ fuel line
- EPA approved
- Double check valve with Speed Prime Technology
- One part covers two common hose sizes
- Stainless steel clamps included
- Not Yamaha-branded
- Still requires the correct hose ID for a leak-free seal
Buying tips
- Match the hose diameter (1/4″, 5/16″, 3/8″, or 8mm/11mm on Yamaha OEM parts) exactly — a primer bulb that’s the wrong bore either won’t seal or will restrict fuel flow.
- Look for “EPA” or “low-permeation” on aftermarket bulbs (Sierra, Moeller, T-H Marine all specify this) — older non-compliant bulbs let more fuel vapor escape and are being phased out.
- A primer bulb that feels rock-hard or won’t hold its prime after squeezing is the classic cracked/degraded symptom — replace it before it strands you, since it’s a $10-$40 part either way.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.