Why are both pumps running? I am not knowlegeble about the fuel line layout but if both pumps draw from a separate tank (each) and feed to a common line to feed the carburetor and have check valves in the line coming from each pump it would make sense that the pump with the higher pressure output (even if 1/2 lb more than the other) will be the pump that will consistantly be filling the line to the carburetor and keeping the check valve closed on the weaker pump. Perhaps the noise you were hearing was the weaker LH pump cavitating and malfunctioning? Make any sense???
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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