Electric or pull start??? Auto choke or manual??? It probably doesn't make much difference but it would be nice to know.
Read on....
Well....you may have fallen victim to the INCOMPLETE CARB CARE FOR HONDA syndrome. These carbs are VERY sensitive to deposits and simply "running the gas out" doesn't prevent deposits from forming inside the tiny passages these carburetors have. It really does sound like your carbs have deposits and will need to be cleaned. But....since you are a nice person...(right??) and asked here first...(you did ask here first? didn't you??) I will give you a thing or two to try that might save you some time....money....and grief.
First off...find the CARBURETOR FLOAT CHAMBER DRAIN SCREW. That screw is YOUR friend. Item #6 in the parts page illustration below. Running the gas out...as you have been doing and THEN, taking the cover off and opening that screw and draining the carb WILL go a long way toward keeping this from happening again if you can get it sorted out this time. It's a bit of a pain of an exercise but WELL WORTH IT. Plus, we are going to use that screw as an access point to see if we can get you up and running and back in the blind asap.
I believe I found this screw. It is flat had on the front of the carb. When I backed it out gas came out the bottom of the carb and out the clear hose that is connected to the side cover.
http://www.boats.net/parts/search/H...ter/BF15DK3 SHSA/CARBURETOR (AUTO)/parts.html
Check the ACCELERATOR PUMP plunger and see if it is seized or not. It is a little silver pin that is housed inside a "bellows" or boot on the side of the carburetor. It is depressed anytime the throttle is moved and returns when the throttle is idled back. See items 14 and 12 in the illustration above. To see if it is seized, simply work the throttle and watch for the rubber bellows to compress and relax as you throttle up and down. If it is seized...that's not great but it's not horrible either. If it is free though...it may help us force some cleaner through the carb...so THAT would be helpful.
The plunger seems to be moving fine. Probably 1/8" of travel. With the turn of the throttle
Ok, now I'm going to take you to another parts page in the new link below:
http://www.boats.net/parts/search/H...7 and Later/BF15DK3 SHSA/FUEL PUMP/parts.html
Item 4...the "fuel chamber"....is housed inside a similarly shaped rubber "holder"...item 3....that is attached to the engine oil dipstick tube. The fuel chamber needs to be taken off and cleaned out from time to time. Once a season is usually sufficient but more often if your gasoline supply isn't the best. You simply disconnect the lines going to it and slide the holder with the fuel chamber inside off of the dipstick tube. Use WD-40... or any lubricant...to make sliding it up the tube easier. It can be on there pretty tight and so...you need to be CAREFUL not to bend or snap off the dipstick tube while doing this maintenance.
Once it is off and in your hand, simply turn it upside down and shake every bit of LIQUID out of it. Once it is empty, spray a GENEROUS amount of carb cleaner or BRAKE KLEEN or WD-40 into it and shake it around and then drain that out. Re-intall. You're done.
Got it removed, cleaned, and reinstalled
Next....go back to the carb drain screw and remove it. Take some BRAKE KLEEN...using the straw that comes with the can...and squirt it into the carb, through the drain screw hole, until it starts coming out of the vents. Let it drain out...let it sit.... then do it again. Use a whole can of cleaner. On the last attempt...quickly re-install the drain screw so that the cleaner is left trapped in the bottom of the carb.
I backed the screw out a few turns then sprayed down the clear hose and I could hear it bubbling inside the carb and sputtering out of the vents. With the hose held up no cleaner came back out and I tightened the screw back up. Then I worked the throttle to move the accelerator pump. Everything is just sitting in there now. I haven't tried to crank it up.
If the accelerator pump was working when you checked it, this is where you would work the throttle rapidly a few times to get the cleaner to be pumped through the accelerator pump circuit inside the carb. Then let the outboard sit for at least a couple of hours before trying to restart. You do not have to drain the BRAKE KLEEN from the carb before starting and it may help to leave it in there while trying to first fire the engine.
I hope this works for you. If it doesn't....the carb will likely need to be removed and cleaned. It's not all that hard to do but iit's not for EVERYBODY to try either. It all depends on how handy you are with the hands.
Good luck.