JLM MARINE Outboard Fuel Pump for Mercury 30-300 HP — Direct-Fit 14360A78, Corrosion-Resistant

The JLM MARINE 14360A78 is a direct-fit mechanical outboard fuel pump engineered to replace Mercury/Mariner original units for 30–300 HP two- and four-stroke engines.

Designed for boaters and marine technicians who need a dependable replacement fuel pump, this JLM MARINE assembly matches common Mercury part numbers and fits a wide range of outboard applications. Built for saltwater use and routine engine loads, the unit focuses on reliable fuel delivery and corrosion-resistant construction so your engine runs smoothly while underway.

Will this pump fit my Mercury or Mariner outboard?

Yes — the 14360A78 is manufactured as a direct replacement for many Mercury/Mariner mechanical fuel pump part numbers. It covers two- and four-cylinder models as well as several 3.0L and higher-displacement EFI and jet-drive engines noted by Mercury compatibility lists.

• Replaces Mercury/Mariner numbers including 14360A78, 14360A73, 14360A71, 14360A49 and others.
• Compatible ranges: 2‑cyl 30–40 HP, 3‑cyl 40–90 HP, 4‑cyl 115–125 HP, and many 3.0L EFI 200–300 HP models.
• Works with jet and V‑drive variants where listed by manufacturer fitment.

How does this pump improve my boat’s fuel delivery?

The pump is engineered to provide steady, consistent fuel flow to the carburetor or EFI regulator, reducing surges and hesitation under typical boating loads. Its mechanical diaphragm and valve layout replicate OEM performance for smoother throttle response and fewer interruptions while underway.

• Consistent diaphragm action stabilizes fuel pressure during acceleration and idling.
• Precision-valved ports reduce backflow and vapour lock risk in normal conditions.
• Intended as a one-to-one replacement to restore original fueling characteristics.

Is this pump durable enough for marine use?

JLM MARINE builds this pump with materials and finishes chosen for resistance to moisture, salt, and engine-room fluids common in boating environments. While regular maintenance is still required, the assembly is meant to withstand typical exposure and retain service life comparable to OEM parts.

• Corrosion-resistant external coating and hardware suitable for saltwater exposure.
• Robust diaphragm and seals designed for repeated fuel cycling.
• Manufactured and tested to meet marine replacement expectations for longevity.

What should I know about installation and compatibility checks?

Installation follows standard mechanical-pump procedures: remove the old pump, transfer fittings and linkage if needed, and secure the new unit with proper torque and gaskets. Confirm port orientation, mounting bolt pattern, and linkage geometry against your engine’s service manual before fitting.

• Match bolt pattern and mounting flange to your engine before installation.
• Verify inlet/outlet hose sizes and fuel line routing to avoid kinks or strain.
• Check for proper gasket or O‑ring seating and test for leaks after initial run.

Who is this for: The JLM MARINE 14360A78 is aimed at boat owners, DIY marine mechanics, and professional repair shops seeking an affordable, OEM-compatible replacement for Mercury/Mariner mechanical fuel pumps across a broad horsepower range. If you need to restore reliable fuel flow for 30–300 HP outboards, want parts that resist marine conditions, and expect straightforward bolt-on installation, this pump is an appropriate choice. Always cross-reference your engine serial or parts diagram to confirm compatibility before purchase.