Leah, First off WELCOME TO THE FORUM.
Now for the business at hand. When you say the coach starts but won't turn over, I am assuming you mean the engine cranks but won't start. Is that correct?
Second question: You have a Chevy chassis, so I am assuming you have the 454 Chevy engine also. Is that correct?
As Zmotorsports pointed out, oftentimes it's more difficult to explain WHAT is happening than it is to fix it. To get the best answers, provide as much information as possible. You told us your coach, but since the problem is in the engine, provide as much info on the drive train. My guess is it's a simple fix as the coach was running fine until you stopped to empty the tanks.
Again, guessing here but I would look for a bad ground somewhere on the coach. Does the radio work? Let us know.
Finally, if all else fails, take a look at the link provided below. It may help you find a reliable mechanic in the Kansas City area...these beasts are intimidating, but their drive trains are not much different than the cars we drive.....Dennis
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