Replacement Diaphragm Pump Zenoah K261881260 for G450PU/G620PU (without packing)  [K261881260]

Diaphragm pump designed for scale engine maintenance

The Zenoah K261881260 diaphragm pump is a replacement component specified for Zenoah G450PU and G620PU engines in RC use. It performs fuel transfer duties within the engine's fuel system and is supplied without retail packing or extras.

Install this pump to remedy inconsistent fuel delivery, replace a worn membrane, or bring back dependable priming. The key material is a nylon diaphragm, and the part is suitable for model engine maintenance rather than any full scale engine applications.

Fitting advice: drain and ventilate the fuel tank prior to removal, match the pump to the engine mounting pattern and fuel hose ends, and ensure all sealing faces and O rings are clean and correctly positioned. Run a low throttle check after fitting to confirm there are no seepage points.

Troubleshooting tip: the pump will not change carburation settings, but correcting a failing diaphragm often eliminates misfires or stuttering caused by irregular fuel flow. Inspect the diaphragm regularly and replace if you notice tears, stiffness, or contamination.