I have a low-hours 2002 F40 4 stroke on a 20' pontoon boat. Seems to start well enough but will quit after a few seconds idling unless you manually work the throttles. If you manage to get it in gear before it quits it seems to run well enough at WOT but will quit as soon as you throttle back and then be hard to start unless it sits for a few minutes. Changed the fuel filter and dropped some fresh fuel and Seafoam gas treatment in the tank (it has a 26g onboard plastic tank that had some old gas in it - and yes, I know that's not good). Acts like it's fuel-starved but squeezing the fuelline bulb doesn't seem to help. I was going to try hooking up a seperate fuel supply to see if it is a fuel delivery problem - perhaps with the connector. I'd like to try and eliminate some of the obvious possibilities before handing it off to a mechanic. Any thoughts?
