IF IT IS LEAKING, YOU WOULD NEED A NEW PUMP, AS THEY ARE NOT SERVICEABLE , THERE IS AN OIL RETURN PASSAGE IN THE CYL HEAD TO DIRECT OIL FROM THE CYL HEAD BACK DOWN TO THE BLOCK, THE CHAMBER WHERE THE PUMP SITS IS RIGHT IN THE PASSAGE , THIS LUBES THE PUMP, UN TILL THE SEAL IN THE PUMP DIES , JERRY