My carb from the side.
I believe, but am not sure, that this part is the accelerator pump.
The inside looks just like this
Their is a diaphragm, metal in the center, that sits on a spring.
Lat year, the motor ran rough, so I brought it into a good shop, and it ran great. Until I let it sit a couple of weeks. (Thank you ethanol) The boat was on the water, so I pulled the carb, and brought it to a different, but equally reputable shop.
On the last day of the season, I put the carb on, and the motor started instantly and ran great. But, it leaked fuel like a sieve. I brought the carb back to the shop, and just picked it up this week. They had replaced the accelerator pump diaphragm.
I put it back on, and it still leaks. While I am sure the shop will stand behind their work, it is 1.5 hrs from my house. And, at this point, they may need to see it on the motor while it is leaking. They really shouldn't. It is possible to reproduce this leak by pumping fuel into the carb, then doing the equivalent of hitting the throttle. I really don't want to remove a motor and make 2 three hour round trips to fix this.
I have tried to reseat the diaphragm, but it keeps leaking. There must be some kind of trick. Anybody know the trick?