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  1. 2

    Merc 150 power loss update

    Greetings. I posted a week or so ago concerning WOT power loss in my 74 150. After rebuilding the carburetors, replacing pump diaphragm and checking connections on built in tank, it became clear after running with a remote tank that I needed to replace the anti-siphon valve with a 3/8 barb...
  2. 2

    Thanks Dilligaf!

    Thank you for the response to my question about fuel system problems. I'll get it taken care of and appreciate the clarification on function of the tube.
  3. 2

    poor idle/miss

    I have a 74 Inline 150. My symptoms are a rough idle and WOT power loss (occasional). I am currently rebuilding carburetors and replacing pump diaphragm and check valves. My question is regarding the the long black tube that runs from the top of the motor to the bottom cylinder below the fuel...
  4. 2

    WOT loss of power

    Greetings (I'm new to the board). I have a 75 Inline Merc 150 HP that runs well out of the hole and onto plane, but stalls at or around WOT (5000-5500 RPMs). Sometimes it will run well for several minutes but invariably stalls. I have a new built in tank, primer bulb and Tempo inline filter...
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