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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Fuel is drawn from both tanks at the same time. There are sometimes valves but these are not for anything then shutting off a tank if there is a problem, under normal use both should be open to draw from both tanks. Ensure the valve is open to both tanks or turn valve only to the tank you are not using and see if it will draw fuel, if not then you will need to inspect the system for restriction or a hole (if it sucks air there is a hole or not fuel such as a hole in the pick up tube, if it sucks to a vacuum lock then there is a restriction.
Thank you!- Joe
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I stated a valve not a manifold, I explained that some use a valve if not they are just plumbed together, in this case you still follow as I explained you just do so by disconnecting the problem fuel tank line from the working tank and that is how you will conduct your tests.
Does that make better sense? If not please let me know so I can make sure we are on the same page. :)
Sorry for the delay. Dealing with septic issues. My apologies.
This means the line that is the common draw line for the engines to that tank has a restriction or hole in it or the valve is bad. The mechanic should be able to test and see if the problem is a restriction, a hole or bad valve, a hole and it will only suck air the other two will create a vacuum lock.
It is one of those three problems and will require disconnecting the fuel hose from that tank to diagnose.