Herman, I use a hose from our coach propane tank. Something plugged the Weber regulator on our Q-100 with the yellow stuff soon after I started using the 25' hose. I had used the hose on our fire ring and Coleman stove several times with no problems. I purchased a new regulator at Ace Hardware and now no problems whatsoever. I have heard of others having problems with the stock regulator after converting to the higher pressure(?) coach tank. At least I think the tank is at higher pressure. Don't know for sure, but something caused the failure. I had set my stock regulator on the floor at Ace and the yellow fluid came pouring out. Shaking it caused a lot more to come out.
By the way, our coach propane tank is a 50 gallon model and gets used for our four burner coach stove & oven, furnaces (2), outside Coleman stove, Weber grill, coach Onan Emerald III generator, and Fire pit. So we are replenishing the 44 gallons in the tank frequently.
Was there too much of "that smelly additive" in our tank? Don't know, but everything worked fine except for the original Q-100 regulator.