I’ve run into a problem I need some insight on.
I run a boat with 3 main engines, (MTU 12V 2000 series) fed by a 1-1/2" fuel pipe which feeds a manifold with separate shut off valves for each engine.
Forward of the manifold is a bronze swing check valve. Last week, the swing portion failed, and subsequently starved the engines for fuel. After continually knocking the valve with a hammer, we made it back to the dock. I promptly removed the valve, and replaced it with a new one, minus the swing check portion. Essentially a coupling with nothing to restrict the flow of fuel.
I understand the purpose of having the valve in place. It would prevent fuel from going back into the day tank, and having the engines lose their prime when not being run. Otherwise, what purpose does the check valve serve? It seems like a dangerous item to have in the fuel line. Are there regulations that require a check valve in the fuel line? I’ve worked on several vessels, and this is a first.