Murphy's law in full effect. Taking the camper out this weekend. The temps are going to be cool overnight, 40's for lows. To keep the kids and wife happy I planned on using the furnace. I tested the furnace the day before we left, worked perfect. Now last night I tried to run it and I'm not getting any gas flow. I get spark, the fan comes on but will not ignite. Yes the tank has gas. I tried the stove and I have have flow into the camper. Thoughts?