JDMSPEED High-Pressure Electric Fuel Pump PH500-M014 for Mercruiser EFI V6/V8 - Non-Threaded Cool Fuel, Direct Fit

JDMSPEED High-Pressure Electric Fuel Pump (PH500-M014) is a direct replacement for Mercruiser EFI/MPI V6 and V8 marine engines, delivering reliable high-pressure fuel delivery for models such as 305, 350, 454, 502 and more.

This compact, 100% new electric fuel pump is built for fuel-injected marine applications that require a high-pressure supply to maintain efficient combustion and faster engine starts. Designed to match the fit and function of Mercruiser part numbers like 861156A1 and 807949A1, the unit also replaces several aftermarket and OEM references including Sierra 18-35433 and Mallory 9-35433. It is intended for use in "cool fuel" assemblies where the pump outlet is non-threaded and integrates directly into the fuel line routing common on many GM-based marine EFI systems.

How does this pump fit my Mercruiser EFI setup?

The pump is engineered to be a direct replacement for common Mercruiser high-pressure fuel pumps used on V6 and V8 EFI engines. It follows the non-threaded small outlet design typical of "cool fuel" assemblies, so installation aligns with original equipment routing. Check part numbers and physical outlet type before purchasing to ensure compatibility.

• Replaces Mercruiser 861156A1 and 807949A1
• Compatible with GM-based EFI V6/V8 305, 350, 454, 502 engines
• Non-threaded small outlet for cool fuel assemblies
• Direct-fit dimensions for many original pump brackets

What performance can I expect on the water?

This high-pressure electric pump supplies steady fuel pressure needed for EFI systems to atomize fuel correctly and support reliable starts and smooth throttle response. It’s intended for standard marine fuel applications rather than race-tuned setups, offering consistent delivery for cruising and recreational use. Properly installed and maintained, it helps preserve engine responsiveness and fuel efficiency.

• Stable high-pressure output for consistent injector flow
• Improved cold start and acceleration responsiveness
• Designed for continuous marine duty cycles
• Works with original fuel lines and connectors in most builds

What should I know about installation and plumbing?

Installation typically follows the original pump location and mounting points; however confirm the small outlet is the non-threaded style used in cool fuel assemblies. Electrical connections require proper fusing and secure terminals to ensure dependable operation in the marine environment. If unsure, consult a marine mechanic or refer to your engine’s service manual for torque, wiring, and safety guidelines.

• Non-threaded outlet accepts existing cool fuel hose routing
• Requires correct electrical supply and inline fuse
• Mount using vibration-isolating hardware where possible
• Inspect fuel lines and clamps for wear during replacement

Is this pump durable for marine use and which parts does it replace?

Constructed as a brand-new replacement unit, this pump is intended for marine environments and daily boating conditions rather than extreme racing. It replaces multiple OEM and aftermarket part numbers to simplify sourcing and compatibility checks. Routine inspections and proper filtration will help extend service life in saltwater or freshwater use.

• New unit with quality-controlled components
• Replaces: Mercruiser 861156A1, 807949A1; Sierra 18-35433; Mallory 9-35433; Pro Torque PH500-M014
• Suitable for standard marine operating conditions
• Regular maintenance improves longevity

This JDMSPEED pump is aimed at boat owners, mechanics, and marine technicians who need a trustworthy replacement for EFI-equipped Mercruiser and GM-based V6/V8 engines. If you operate a fuel-injected marine engine that uses a cool fuel assembly with a non-threaded outlet, and you want a direct-fit, high-pressure pump that mirrors common OEM part numbers, this unit is a practical choice. Always verify part compatibility with your engine serial number or service documentation before ordering.