I have a 1984 35hp Mercury and it has been running great. The last two trips out after trolling for a couple hours the engine would just run the gas out of the fuel line. I repeated pumping gas in the line several times and it just would run it out and die. I then pumped gas in and ran it at full throtle and it ran normal then slowed down to trolling speed and it ran fine again. Just before the first time this happened, I ran the boat in shore and there was a lot of brush and moss and I am starting to think that some of the moss may have gotten into the engine through the rear intake. Not sure if thats the case. Does anyone know what needs to be adjusted? I am going to check the lower unit but I know something else has to be adjusted just not sure what.