Reply To: 57 Johnson 7 1/2 Starts but won’t run

[Don]

Getting involved here late, so don’t want to “muck up” the process asking questions that have already been asked/answered.  Sounds like you have ruled out the tank by trying two different tanks, both of which operate fine on a different engine, correct?

You are probably getting ready to pull the intake manifold to check those black rubber pressure check valves.  I would check the pressure nipple/hose/connector first/again though before going into the intake manifold.  Oftentimes, those pressure nipples got “soldered closes” when converted to single line/fuel pump systems.  Make sure the rubber hose isn’t damaged/plugged, the same goes for the air outlet prong on the engine’s fuel/air connector.

Like Bill says, the intake manifold isn’t a big deal on these engines, try removing the outer cover only, there is no sealer used on the gaskets, the rubber pressure valves are clearly visible once the outer cover is removed.

Again, like Bill says, not uncommon for the water to leak out around the shift handle.  The shift handle bushing is small and subject to wear creating an easy exit for exhaust/water.  I wouldn’t worry about it until the next time the powerhead is pulled.  You mentioned the engine would not shift into gear, did you check the shear pin?