I got my 1992 Johnson 150 hp up and running. Took it out on the water to clean out the fuel system. Started it up and let it warm up then brought the throttle down to an idle. I then put it in reverse expecting it to die and it worked perfectly. I then put it in Drive and drove it around the lake then planed it out and it was working beautifully at 45 to 5,000 RPMs. After about 45 minutes I got a buzzer in the dash it was still idling and running just fine I noticed the volts were at around 20 on the meter which I thought was odd so I shut it down and went to the battery box check it out didn't see anything but started smelling something like plastic or wires then I looked at the engine and saw that there was smoke coming out. I took the cover off the engine and the silencer from the intake and the whole fuel system was melted and there was a little bit of a fire which I put out with the fire extinguisher. The question is what could have caused this any feedback would be greatly appreciated. The model is a VJ 150 g l e n c.
