Zenoah K261881260 Fuel Diaphragm for G450PU and G620PU (without packing)  [K261881260]

Fuel diaphragm assembly for RC engine fuel systems

The Zenoah K261881260 diaphragm pump is intended as a replacement part for Zenoah G450PU and G620PU model engines, performing the mechanical task of transferring fuel within the engine feed system. The unit is supplied without packing or accessory extras.

Use the part when addressing poor fuel delivery, replacing a damaged diaphragm, or reinstating reliable priming. The diaphragm is made of nylon, chosen for its balance of flexibility and durability, and the component is designed strictly for model engine service rather than heavy duty applications.

Simple installation guidance: remove residual fuel and ventilate the tank, confirm the pump aligns with the engine mounting and fuel lines, and clean sealing surfaces and O rings before tightening. Test at idle and then at part throttle to ensure a leak free installation.

Performance note: while the diaphragm pump does not alter mixture or ignition timing, steady fuel supply from a serviceable pump supports predictable throttle response. Periodic inspection for deformation or blockage will reduce the chance of uneven running under load.