Stens Kohler Fuel Pump Kit 12-559-02-S OEM replacement — 1-5/8" arm, 1/4" fuel line

Stens supplies the genuine Kohler fuel pump kit 12-559-02-S — an OEM replacement designed to restore proper fuel delivery on compatible Kohler CH, CV and CVV engine models.

This replacement fuel pump is an authentic Kohler component distributed through Stens as an authorized dealer. It’s intended for small engines that require the 12-559-02-S pump specification: a 1-5/8" arm length and compatibility with 1/4" inner diameter fuel lines. Installing the correct OEM pump helps maintain factory performance and fitment without the guesswork of aftermarket substitutes.

Which Kohler engines use this fuel pump kit?

The 12-559-02-S pump is compatible with a range of Kohler single- and twin-cylinder engines. It fits selected CH11–CH15, CH410–CH450, CV13–CV16 and CV430–CV493 model families, but exact fit depends on the engine's model, spec and serial numbers.

• Fits CH series: CH11 through CH15 and CH410 through CH450 where OEM parts call for 12-559-02-S.
• Fits CV series: CV13–CV16 and CV430–CV493 variants requiring this pump.
• Uses 1-5/8" pump arm length and accepts 1/4" ID fuel line connections.
• Always verify fit by checking your engine’s model, specification and serial numbers.

How do I replace the pump and what should I check during installation?

Replacing this fuel pump typically requires basic hand tools and attention to fuel line routing and mounting orientation. Drain or contain fuel, remove the old pump hardware, transfer any required gaskets, and fit the new pump so the arm and inlet/outlet align with factory locations.

• Shut off fuel and relieve pressure before removing the old pump.
• Confirm the 1-5/8" arm clears nearby components and moves freely.
• Use 1/4" ID fuel tubing and secure clamps on inlet and outlet connections.
• Tighten mounting hardware to Kohler torque recommendations where available.

What distinguishes this OEM Kohler pump from aftermarket alternatives?

Genuine Kohler parts are manufactured to the brand’s original specifications, ensuring identical fit and materials to the component installed at the factory. That consistency reduces compatibility issues and minimizes the need for modification or adaptors common with aftermarket replacements.

• OEM materials and tolerances match factory-installed parts for reliable operation.
• Direct bolt-on fit reduces installation time and potential leaks.
• Supplied part number 12-559-02-S corresponds to Kohler service documentation.
• Sold through an authorized dealer for authenticity assurance and support.

What fuel line and arm length specs should I confirm before ordering?

This pump is built for 1/4" inside diameter fuel lines and has a 1-5/8" actuator arm length. Confirming these two specs with your engine prevents fitment problems and ensures the pump will mate correctly to existing hoses and throttle linkage.

• Use 1/4" ID fuel hose to match the pump’s inlet and outlet fittings.
• Verify the 1-5/8" arm length fits your engine’s arm clearance and linkage.
• Check engine documentation or Stens/Kohler lookup using model/spec/serial numbers.
• Contact support with engine details if you’re unsure about compatibility.

Who this replacement is for: this Stens-supplied, genuine Kohler fuel pump kit 12-559-02-S is intended for owners, technicians and equipment shops maintaining Kohler CH and CV series small engines that require OEM-level fit and function. Choose this kit if you want an exact Kohler replacement for reliable fuel delivery, straightforward installation, and assurance that the part matches factory specifications. If you’re unsure which part number you need, provide your engine model, specification and serial numbers and an authorized dealer can confirm the correct pump for your unit.