Recreational Vehicle Lpg Tank Valve/gauge problems of the 2000 Dodge Ram 1500

While I was driving on a city road, the vehicle just shut off. Almost like I turned the ignition off. All gauges worked as normal, stereo, a/c, etc(aux power components) . No check engine light came on or anything. Pulled to side off road and turned hazards on. I tried to restart vehicle it would turn over but would not start, I then noticed in the odometer that it stated "no bus" . Thinking it may have been an electronic system issue with fuel system I checked fuse box under the hood. I pulled the fuel system relay out then reinstalled. Truck started up ( all this took about 5-10 min). So I purchased a new relay but waited to have see if issue was resolved. Sitting in a parking lot a few days later I started vehicle and and started to load groceries , the vehicle shit off again, I tried to restart and same thing, looked at odometer and again it stated 'no bus" so I installed new relay. Put in off position and tried again. Still no luck. Waited a few min and tried to start vehicle again and it started up. Looked up on forums to find possible solution and the next step was to try the coil. I have installed new coil on 06/05/2018 and am currently waiting for issue to come again. To day is 06/06/2018. Thinking back the vehicle has had some jerking motions that almost resemble the same symptoms but never fully died , just jerked really bad but continued to drive. This is unsafe for if I was on a highway it kills power to the power steering pump and could cause an accident.

The vehicle stalls when slowing down or stopping at a stoplight. No codes appear and the power steering and brakes no longer work. The vehicle may startup immediately or take two hours to restart. The radio and lights work, but the gauges don't engage when trying to restart the car. The problem occurs during warm weather days. The problem has occurred a number of times when my teenage son has been driving the vehicle. I'm afraid the vehicle will stall and place me in a dangerous situation. The problem has occurred a tremendous amount of times over the past year.