If the Farmpro 2450 is the 25hp Jinma, you probably do not have a dipstick for the fuel injector. There should be 2 drain plugs on the bottom. On the left side of the injector (towards the radiator beside the Banjo fitting) there should be a screw with a tube facing downwards. This is the bleeder screw, so as you fill it with oil it will drip out of the tube.
I can't find a picture right now, but hopefully you get the idea.
Aubrey
God is Great, Beer is Good, and People are Crazy! '07 Jinma 254LE