Our year 2000 Nissan 5hp two stroke now leaks gasoline from the front of the carburetor (carbi) when tilted up on the dinghy transom. This started after 7 years of not leaking. The leak is at the opening at the choke flap.
It leaks only when fully tilted.
It leaks only when there is gas in the carbi bowl.
It leaks even when the gas line from the tank to the fuel pump is disconnected at the fuel pump. That removes any connection between the internal tank and the carbi.
It leaked after we replaced the carbi bowl gasket (o-ring), float, needle, spring, drain screw washer. So then....
We replaced the entire carbi with a brand new one (which includes the fuel pump) and it still leaks!
It did not leak in the past when tilted.
Although manufactured in year 2000, motor wasn't really used much until 2011 and from then used regularly, but not heavily. It runs perfectly and starts on the 2nd pull. There wasn't any other event I can think of that coincided with it starting to leak when tilted. We just began to notice fuel on the inside of the transom.
The photo shows the leak at the air inlet. The fuel pools a bit right at the edge and appears dark in the photo.
We welcome any suggestions about the possible cause; really thought replacing the carbi would solve the problem.
It leaks only when fully tilted.
It leaks only when there is gas in the carbi bowl.
It leaks even when the gas line from the tank to the fuel pump is disconnected at the fuel pump. That removes any connection between the internal tank and the carbi.
It leaked after we replaced the carbi bowl gasket (o-ring), float, needle, spring, drain screw washer. So then....
We replaced the entire carbi with a brand new one (which includes the fuel pump) and it still leaks!
It did not leak in the past when tilted.
Although manufactured in year 2000, motor wasn't really used much until 2011 and from then used regularly, but not heavily. It runs perfectly and starts on the 2nd pull. There wasn't any other event I can think of that coincided with it starting to leak when tilted. We just began to notice fuel on the inside of the transom.
The photo shows the leak at the air inlet. The fuel pools a bit right at the edge and appears dark in the photo.
We welcome any suggestions about the possible cause; really thought replacing the carbi would solve the problem.