We run our Merc 44 with two pumps and turn the engine about 8,600 RPM. I know folks that only run a single pump on their 44 MOD engine and it works fine. I am sure the 5 pump configuration will provide far more fuel then is needed. The single feed line might be an issue but if this was made into a larger manifold it might distribute the fuel better.
Second thought! Looking at the carbs they have a rubber hose between each carb so 6 carbs equal's five hose sections. If a tee was placed in each hose then the 5 pumps would connect very nicely and the engine would have a very nice balanced fuel system.
Also remember that the 75-H engine only has 2 fuel pumps and a inlet fuel distribution block.
Alan
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