Pump Mount Seal for FS-70U - OS44714200 by O.S. Engine  [OS44714200]

Pump mount seal designed for FS-70U engines

This pump mount seal is an aftermarket replacement intended for FS-70U engines in RC models. It creates the sealed junction between the pump body and engine casing to preserve fuel flow and prevent seepage that can harm consistency.

Keep the installation practical: remove old gasket material from mating surfaces, check that the pump flange sits true, and use gradual, even torque to avoid distorting the seal. The item is focused on maintaining a leak-free assembly rather than altering engine output.

Consider this seal a service item during engine overhauls. A correctly seated seal supports predictable fuel feed under standard RC conditions and helps isolate fuel delivery from tuning adjustments or troubleshooting.