What is the snake's weight? As Chris H. mentioned, tube feeding is the LAST resort and at 9 weeks shouldn't be necessary. I have had a couple kenyans go as long as 5-6 months and start feeding.
Be VERY patient (don't even look at the snake for 1-2 weeks). Make sure it has 2-3 of substrate to burrow in (I prefer aspen). Make sure the warm side is between 95-100F and the cool side is 75-80F.
As stated above, sometimes snakes just don't make it.....
Best of luck,
Chris
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Christopher E. Smith
Contact
Captive Bred Herps
Wildlife Research & Consulting Services, LLC

