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72 Mercruiser 120 hp inboard

72 glastron

New member
Fires but won't keep running. Changed fuel pumd, distributor, carburetor rebuilt, fuel water filter and soleniod all new. Feels like fuel getting pumped back out not into. Help trying to rebuild and get this boat on water.
 
inlet ,outlet reversed, that or the cam is wiped where the fuel pump rides or the fuel pump was not an exact match and the pumps lever does not contact the camshaft
 
Remove the pump and verify you can push the lever. Then using a dowel on the cam, spin the motor to see if the dowel moves in and out. No movement =no cam lobe left
 
Remove the pump and verify you can push the lever. Then using a dowel on the cam, spin the motor to see if the dowel moves in and out. No movement =no cam lobe left

Runs when gas poured into carburetor but won't continue to run when let kff key or stop manually trying to feed gas. Will try switching lines. Bought new fuel pump this secknd one as none was on it when bought boat.
 
If motor fires , when key is in cranking position and as soon as you let go of key back in run position and motor dies could be ignition switch.
 
inlet ,outlet reversed, that or the cam is wiped where the fuel pump rides or the fuel pump was not an exact match and the pumps lever does not contact the camshaft

Ok switched the lines around and it ran. Thank you have spent a lot trying to reburb this 72 Glastron. Excited to get out on the water.
 
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