The filler tube on V10s in Motorhomes, I believe in most cases is pretty long and has a turn or two in it. is it possible, the cap is still stuck in the filler tube, and didn't make it down to the engine?
Ify ou can confirm somehow using the methods already suggested that the cap is in the filler tube, and you can't pull it out with a grabber tool of some kind....Then I'd just pull the filler tube off, then you should be able to push the cap out.
If its not in the filler tube and is already down in the cylinder.....Then like already said, you need to go ahead and pop the cylinder cover off and try to get it out before it does serious damage.
Oh, and like already said.....Running the engine now, before you get that cap out, would be a very, very BAD idea!
