GIXXY ,
I have two Ram 500's. I just leave a piece of brass tubing stuck in the tubing on the input side of the solenoid, and attach a propane bottle to it when I start. The propane bottle has a regulator on it, but some guys just modify the standard torch valve to accept tubing and plug it in to start. You can turn the valve down if it's to much. That's all you need, keep it simple. Works every time.
Thanks,
Dale