Sierra 18-35302
Sierra 18-35302 — Product description
Keep your Yamaha outboard running smoothly on the water with the Sierra 18-35302 fuel pump, a reliable aftermarket replacement designed to match the performance of the original Yamaha part 66M-24410-10-00. Boat owners know how frustrating it can be when fuel delivery falters mid-trip—erratic idling, hesitation under load, or outright stalling. This pump addresses those issues head-on, delivering consistent fuel pressure to your engine's carburetors for dependable starts and steady power.
Why Choose the Sierra 18-35302 for Your Yamaha Outboard?
Sierra's engineering focuses on marine-grade durability, using corrosion-resistant materials that stand up to saltwater exposure, ethanol-blended fuels, and the vibrations of high-speed boating. Unlike some generics that fail prematurely, this pump features a precision diaphragm and robust internals that mimic OEM specs, ensuring seamless integration without modifications. It's a smart upgrade for weekend warriors and serious anglers who demand reliability without the premium price tag.
- Direct Fit Replacement: Bolts right in, saving you hours of guesswork and shop time.
- High-Quality Diaphragm: Handles modern fuels with flexinol material for longer life.
- Impulse Line Compatible: Works with both pulse and vacuum systems common in Yamaha 40-60HP models.
- Easy Maintenance Access: Simple design for quick inspections during routine servicing.
Common Fuel Pump Problems It Solves
Spotting a failing fuel pump early can prevent bigger headaches. Look for symptoms like hard starting after sitting, black smoke from incomplete combustion, or fuel leaks around the pump body. The Sierra 18-35302 restores proper flow rates—typically 5-7 gallons per hour at idle—eliminating these gremlins. Pro tip: Always replace the fuel filter and check lines for cracks during install to maximize longevity.
Installation Insights from the Field
Swapping this pump is a straightforward DIY job for most mechanics. Disconnect the battery, relieve fuel pressure by pinching the hose, then remove the old unit's mounting screws and hoses. Note the orientation of the inlet/outlet—clockwise rotation for most Yamahas. Use new gaskets if provided, and prime the system by cycling the key before firing up. Total time? Under an hour with basic tools. If you're new to this, bleed air from the lines to avoid flat spots.
Long-Term Performance Tips
To get years of service, store your outboard with stabilized fuel and run it dry seasonally. Inspect the pump annually for varnish buildup, especially with E10 or higher ethanol mixes. Pair it with a quality inline filter to catch debris that shortens diaphragm life. Boaters report this Sierra unit outlasting originals in harsh conditions, thanks to its upgraded seals and materials.
Frequently Asked Questions
What Yamaha outboard models is the Sierra 18-35302 fuel pump compatible with?
This pump fits a range of Yamaha 40-60HP two-stroke outboards from the late 80s to early 2000s, cross-referencing the OEM 66M-24410-10-00. Always verify your engine's serial number for exact match.
Does the Sierra 18-35302 handle ethanol-blended fuels?
Yes, its diaphragm is formulated with ethanol-resistant materials, making it suitable for E10 and similar blends common today—unlike some older OEM pumps that crack under exposure.
How do I know if my fuel pump needs replacing?
Signs include difficulty starting, engine starving at high RPM, or visible fuel weeping. Test by squeezing the primer bulb—if it firms up quickly but softens under load, the pump is likely weak.
Is installation of the Sierra 18-35302 tool-free?
Mostly— you'll need basic sockets for mounting bolts and pliers for hoses. No special tools required, and it reuses factory hardware.
What's the expected lifespan of this fuel pump?
With proper maintenance, 3-5 years or 500+ hours in marine use, outperforming many stock units in real-world testing by owners.
Can I use this pump on four-stroke Yamaha engines?
It's optimized for select two-stroke models with diaphragm-style pumps. Check your service manual for four-stroke compatibility, as they often use electric pumps.
Does Sierra offer a warranty on the 18-35302?
Sierra parts come backed by manufacturer support—contact your seller for details on coverage terms.
Upgrade your Yamaha's fuel system today and hit the water with confidence. This Sierra pump isn't just a part—it's peace of mind on every outing.
SKU: NVN-4003510
MPN: 18-35302
UPC: 808282343323
Technical specifications
| Brand | Sierra Engine Parts |
| Model | Sierra 18-35302 |
| SKU / MFR# | 4003510 |
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