Jinma 254 Fuel pump bleeder leak

First  pull the screw out and see what is stripped if you are lucky it will be the screw. Use a thread pitch gauge to see what it is and get a replacement and I think there is a sealing washer there too. If it is the hole you will have to tap it with the closest size up being very careful to get the shavings from going into the pump. Either metric or sae will work if you can get a appropriate matching screw and washer. Many of the Chinese machining are oversized holes and undersized screws so the threads are weak and we wont get into questionable metals.

I agree with David. That section of the pump assembly contains the individual barrel and plunger sub-assemblies. The bleeder screw accesses the fuel cavity and isn’t accessible from behind, so be extremely careful in re-tapping so as not to get any particles in the fuel cavity. Individual parts are not available for the injector pumps or governors, so be careful.