I have twin 150 HPDI's (2001 models) The fuel flow gauge is not giving me a correct reading. While trolling it fluctuates from around 3 to 18 GPH, also the fuel burned is off to. I cant find the part # for the little meter that measures the fuel flow. I have separate ones for each motor mounted after the water separators. Could that be the issue? I am getting ready to replace the fuel lines, I fugured on replacing those while Im at it.