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Late info

Sorry I didn't catch your post in time. This was the exact problem with my 93 burb. I bought a new belt and got the one that was for the model with air pump and mine didn't have one. The belt fit, but it was loose. I did save the original and it was closer in size to the non-airpump belt. The intermittent problem of the belt jumping off has ended. Sadly, I had replaced the idler and tensioner pulleys first, thinking that was the problem.
 
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