Yes, and my high school teacher said that one of the engineer's duties was to watch those tubes, which showed the fuel going to the engines and let out a yell if he saw any water, especially on takeoff. Maybe he could switch tanks to fix that.
I read where on British PBY crew said they were given canned goods so they could have something to eat for their very long ASW missions out of South Africa. They would take those canned goods and toss them in the bottom of their ship, and for very little money would buy fresh steaks and cook them during the flight. The canned goods served as emergency rations in the event they ended up on some beach somewhere due to mechanical problems. I wonder how many pounds of canned goods they ended up hauling around before they presumably removed them during a refit.