On my pontoon I have a Suzuki 140 that will not stay on plain. Boat had been running fine and 2 months ago I left the house to go fishing. Got out to the main lake and it died. Would not rev up. Took it to a Suzuki dealer and he had it for a month. Replaced all fuel lines on motor and replaced or cleaned fuel filters. Said engine computer was bad. Spent $2,000 and it still does the same thing. Took it back and he blames old fuel and built in tank. Drained fuel and cleaned tank and does same thing. Borrowed a tank and hooked that up same thing. Removed bulb from line same thing. Now boat plains out and runs about a 1/4 mile and dies back to idle. Let it idle for a while and it will do same thing. Mechanic said that he gets no codes when it is hooked to the computer. Anybody got any ideas. I am trying to find a new mechanic now. Called another dealer and he says call him back in September. When it dies the bulb goes slack but pumping it does not help.