The pic you sent me was too big, are you talking about the injector pump ?
If you have pressure where the dipstick is on the fuel injector pump, you are going to have to replace that pump, there is nothing you can do to repair that,if you do not have experience with replacing these pumps I recommend you find a tractor shop to do it for you
Tommy
Affordable Tractor Sales
“Your Jinma Parts Superstore”
http://www.affordabletractorsalesco.com