I have a RAM 1000 full auto start I purchased used some time ago. Today I decided its time to run on test stand and make sure all is in working order.

My question is: Why are there 3 fuel tubing lines coming out of the engine instead of two like my RAM 500"s have. One for propane/butane, and one for kerosene. What's the the third line on the 1000 for ??? It's a light bluish color and transparent.