I have a 1986 model 140HP Johnson motor on my 19'Mako. It starts and idles fine. It runs great for a little while then just lays down and dies. It will start up again and then just runs slower and will not take the gas. I changed the water filter cannister and put a new clear inline filter in and a new primer bulb under console and topped off the tank. Then tried it and it did the same thing. I notice that the clear filter does not ever fill up fully and starts to empty as the motor is stalling making me think it is problem in the tank. This tank was replaced several years ago by the previous owner. I have tried removing the gas fill cap in case the vent was stopped up but it did not help. I tried a 6 gallon auxillary tank and ran the whole tank out with no problems so has to be problem between tank and motor. Wonder if I remove the water filter will this make any difference? It is older looking and wonder if there could be something clogged up in it causing this? Any ideas will help.
