Sierra 18-7804

Revitalize Your Mercury Outboard with the Sierra 18-7804 Fuel Pump Kit

Keeping your boat's engine running smoothly on the water starts with reliable fuel delivery. The Sierra 18-7804 fuel pump kit steps in as a trusted aftermarket solution, designed specifically to restore the performance of Mercury outboard engines. Whether you're dealing with sputtering starts, hesitation under load, or outright fuel starvation, this kit tackles common fuel pump issues head-on. Crafted with precision engineering, it mirrors the original equipment manufacturer's standards while offering exceptional value for marine enthusiasts who demand durability without compromise.

Unlike basic patches or temporary fixes, the Sierra 18-7804 provides a complete rebuild solution. It includes all necessary components—diaphragms, gaskets, valves, and more—to get your fuel system pumping efficiently again. Boaters who've swapped in this kit report crisper throttle response and consistent power across RPM ranges, making it a go-to for weekend warriors and serious anglers alike.

Key Features That Set Sierra 18-7804 Apart

• High-Quality Materials: Ethylene propylene rubber diaphragms resist ethanol-blended fuels, preventing premature cracking or swelling common in older designs.
• Precision Fit: Direct replacement for OEM part 23014A1, ensuring seamless integration without modifications.
• Comprehensive Kit: Everything you need in one package, from check valves to springs, minimizing downtime.
• Corrosion-Resistant Components: Brass and stainless steel parts stand up to saltwater exposure and harsh marine environments.
• Easy Disassembly Design: User-friendly for DIY mechanics, with clear instructions to speed up the process.

These features aren't just buzzwords—they translate to real-world reliability. Imagine heading out for a full day of fishing without worrying about fuel delivery hiccups derailing your plans.

Perfect Compatibility for Popular Mercury Outboards

The Sierra 18-7804 shines brightest when matched to the right engines. It's engineered for Mercury and Mariner 4-cylinder outboards ranging from 40 to 125 horsepower. Common models include:

• 1982-1999 Mercury 50HP (serial numbers starting with 0D228859 and up)
• 1988-1992 Mercury 60HP (serial 0F267482 - 0G306998)
• 1993-2000 Mercury 75HP / 90HP / 115HP / 125HP variants
• Inline 4-cylinder configurations across multiple years

Before installing, cross-reference your engine's serial number to confirm fitment. This kit breathes new life into classic powerheads, extending their service life cost-effectively compared to full pump replacements.

Step-by-Step Insights for Successful Installation

Replacing a fuel pump kit doesn't have to be a dockside ordeal. Start by safely disconnecting the fuel line and battery to avoid sparks or leaks. Disassemble the pump housing carefully, noting the orientation of each part. Clean all mating surfaces thoroughly to ensure a leak-free seal upon reassembly.

Pro tip: Use fresh fuel system cleaner during the process to flush out any varnish buildup that could sabotage your efforts. Torque fasteners to spec—typically low values for these plastic and light-metal housings—and test for pressure with a gauge before firing up the engine. Most installs wrap up in under an hour, getting you back on plane swiftly.

"Swapped this kit into my '95 90HP Merc last season—runs like new. No more bogging at WOT." – Experienced Boater

Maintenance Best Practices to Maximize Longevity

A fresh Sierra 18-7804 kit is only as good as your ongoing care. Run your outboard with stabilized fuel to combat ethanol issues. Inspect fuel lines and filters quarterly, especially if stored on a trailer. Annually, check the pump for diaphragm wear by listening for consistent priming whine during startup.

Winterization is key: Fog the engine, drain the carburetors, and fog the pump internals if possible. These habits prevent the very failures this kit fixes, turning a one-time repair into years of trouble-free operation.

Why Boaters Trust Sierra Over Other Options

Sierra's reputation in the marine aftermarket isn't accidental. Each 18-7804 kit undergoes rigorous testing to meet or exceed OEM specs, backed by a legacy of serving millions of engines worldwide. It's not just a part; it's peace of mind for those who can't afford breakdowns mid-trip.

Compared to generic kits, Sierra prioritizes fuel flow rates and vacuum pull that match factory performance. Skip the guesswork—opt for proven quality that keeps your Mercury humming through countless adventures.

Frequently Asked Questions