BioLion Carburetor for Onan QG 4000 / Cummins 0A6562 — Direct-Fit 4KYFA-6747P Replacement Kit with Gaskets & Fuel Filter

This BioLion carburetor kit is designed as a direct-fit alternative for Onan A041D744 and Cummins 0A6562 KY-series generators, providing a ready-to-install solution when worn jets, leaks, or poor throttle response have reduced engine performance. The package arrives with all necessary small parts—gaskets, clamps, a fuel line and filter, and an oil valve—so you can replace the carburetor without running to multiple suppliers.

How will this carburetor improve generator starting and idle?

Replacing a failing carburetor often removes common causes of hard starting and unstable idle. The BioLion unit renews fuel metering and sealing surfaces so the engine receives consistent fuel/air mixture across RPM ranges.

• New jets and passages for predictable fuel flow
• Included gaskets prevent vacuum and fuel leaks
• Fuel filter and line reduce contaminants reaching the carburetor

Is this a direct fit for my Onan QG 4000 or Cummins 0A6562 generator?

This replacement is manufactured to match the form and function of the original 4KYFA-6747P / A041D744 carburetor used in Onan QG 4000 and Cummins KY-series models. To avoid fitment issues, compare the pictured part and the stamped part number on your original before installation.

• Replaces Onan part number 146-0881 and matches A041D744 geometry
• Designed for QG 4000W (4KYFA-6747P) and Cummins 0A6562 models
• Check mounting holes, throttle linkage, and fuel inlet orientation

What comes in the kit and what tools will I need?

The BioLion kit includes the carburetor plus the common replacement small parts you’ll want at hand during the job. Typical hand tools are sufficient; the kit is intended to minimize trips back to the parts store by providing the consumables installers commonly replace at the same time.

• Kit contents: 1 carburetor, 3 gaskets, 4 clamps, 1 fuel line, 1 fuel filter, 1 oil valve
• Tools: screwdrivers, pliers, wrench set, and a clean rag
• Simple bench or in-place swap; expect basic mechanical skill level

Will this stop problems like black smoke, oil seepage, or loss of acceleration?

While a faulty carburetor is a common source of these symptoms, confirming the root cause is important. Replacing the carburetor and associated seals often eliminates fuel-rich running, throttle hesitation, and fuel leaks, but inspect related components like the air filter, ignition system, and crankcase ventilation as well.

• Addresses fuel-metering faults that cause black smoke
• New gaskets and oil valve reduce leaks and seepage
• Improves throttle response and acceleration consistency

Who is this for: This BioLion carburetor assembly suits RV owners, marine or small-industrial operators, and field technicians who need a practical, all-in-one replacement for Onan QG 4000 and compatible Cummins KY-series generators. It’s aimed at users comfortable with basic engine maintenance who want to restore reliable starting, clean combustion, and leak-free operation without hunting for separate small parts.