"I don't know. These things aren't equipped with meters. They're supposed to work automatically."
Jayjay pushed Smith aside. "Let me take a look."
Smith frowned as though he resented an ordinary passenger shoving him around, but Jayjay ignored him. He cocked his head to one side and looked at the connection. "Hm-m-m." He touched it with a finger. Then he wet the finger with his tongue and touched the connection again. "There's no gas flow, Smith."
"How do you know?" Smith was still frowning.
"There's a gap there. That tapered thread isn't in tight. If there were any gas flowing, it would be leaking out." Before Smith could say anything Jayjay began unscrewing the coupling. When it came apart, it looked just the same as it had before Smith had put it together.
In the dim glow from the emergency lights, it was difficult to see anything.
"Got an electric torch?" Jayjay asked.
Smith pushed himself away from the screamer panel and came back after a moment with a flashlight. "Let me take a look," he said, edging Jayjay aside. He looked over the halves of the coupling very carefully, then said: "I don't see anything wrong. I'll try it again."
"Hold on a second," Jayjay said quietly. "Let me take a look, will you?"
Smith handed him the torch. "Go ahead, but there's nothing wrong."