pinkie pump
LLLreptile.com sells a pinkie pump and attachments that can be used to liquidate and forcefeed snakes of many different sizes, also if you can afford it i'd recommend that you take him to see the nearest herp vet. i used to work for one and we had special food to feed them to help boost the immune-system, also the vet can tell you if his tongue will have to be removed.
good luck