What is the age of your MH?
If it was a 1900's vintage was the fridge run off level? Older fridges were prone to get an air bubble in the lines if run when substantially off level. The fact that yours starts and you can hear the burner leads me to suspect that given that it worked the last time you used it. The older models could often be salvaged by removing them, turning them upside down and re-installing. I restored one that way in the 1970's.
I had a similar case a couple of months ago, but mine would not start on either gas or electric. I had a bad circuit board. Since yours starts it would seem your board is good. There are a couple of video's on You Tube that show how to check your board.