Two words. Spare Fuel.
I do not have any affiliation with this product, I don’t care if anyone buys it, It just sounds like a product that can enable Robert to help people and stay safe. I seem to remember seeing this or a similar product product in stores over 10 years ago but have never purchased it or used it. It is basically a non-flammable gasoline derivative, I believe that an engine could not run on spare fuel alone, but the residual gasoline left in your lines will allow the engine to start and then the spare fuel keeps it running.
I agree with what others say, around here when someone runs out of fuel they could be driving in a mobile meth lab, are drunk, high, or just crazy. That being said I suppose it could be a person who made an honest mistake and could really use a knight in shining armor.
No good deed goes unpunished though, Sometimes when someone tries to help a stranded motorist a drunk driver plows into the cars and kills or hurts both the stranded motorist and the good Samaritan.
Be careful Robert, the world needs more people like you!