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Mercury 20 hp leaking gas.

T

Thechap1

New member
I apologize if this isn't in the correct location. I have a 2015 Mercury 20 hp boat motor which I am using on my pontoon boat. I used it for the first time this season yesterday. I did run it for a couple of minutes the day before going to the lake yesterday. It took a little while of cranking before it finally started. I used the ear muffs and the water hose when I did start the engine.

We went to the lake yesterday to fish. I tried to start the motor for at least four minutes but no luck. I looked at the motor and saw a film of gas on the water. I assumed I had flooded the motor and let it set for a couple of minutes. I was finally able to get it started. At the first location I saw a film of gas again on the water. These aren't large films but about five inches at the base of the the motor. We went to another location and stopped. I was in the front of the boat and could smell gasoline. I again saw a film of gas and decided to get the boat back to the launch.

When I got home I removed the cowl and couldn't find any leaks. The engine also used a lot more gas as in the post. Any ideas of what is happening? I have a call into the repair shop but but they haven't called yet. Thanks for the help!
 
Do you store it with fuel in the carburetor ?-----Sounds like you need to clean carburetor and replace fuel pump diaphragm.
 
Sorry , not familiar with this new technology.----Sounds like injector issue.----Have your local shop figure it out.
 
racerone said:
Do you store it with fuel in the carburetor ?-----Sounds like you need to clean carburetor and replace fuel pump diaphragm.
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Thechap1 said:
I apologize if this isn't in the correct location. I have a 2015 Mercury 20 hp boat motor which I am using on my pontoon boat. I used it for the first time this season yesterday. I did run it for a couple of minutes the day before going to the lake yesterday. It took a little while of cranking before it finally started. I used the ear muffs and the water hose when I did start the engine.

We went to the lake yesterday to fish. I tried to start the motor for at least four minutes but no luck. I looked at the motor and saw a film of gas on the water. I assumed I had flooded the motor and let it set for a couple of minutes. I was finally able to get it started. At the first location I saw a film of gas again on the water. These aren't large films but about five inches at the base of the the motor. We went to another location and stopped. I was in the front of the boat and could smell gasoline. I again saw a film of gas and decided to get the boat back to the launch.

When I got home I removed the cowl and couldn't find any leaks. The engine also used a lot more gas as in the post. Any ideas of what is happening? I have a call into the repair shop but but they haven't called yet. Thanks for the help!
Click to expand...
 
I also have a 2015 Mercury 20hp 4 stroke. It is carburated not fuel injected. I have a drip of fuel I believe is coming out of the exhaust tube ,but not sure. I could not feel fuel under the carb or around the inline fuel filter. The engine starts and runs OK. The leak seems to stop when I tilt the motor up?? Any one have suggestions? Thanks
 
John in Florida said:
I also have a 2015 Mercury 20hp 4 stroke. It is carburated not fuel injected. I have a drip of fuel I believe is coming out of the exhaust tube ,but not sure. I could not feel fuel under the carb or around the inline fuel filter. The engine starts and runs OK. The leak seems to stop when I tilt the motor up?? Any one have suggestions? Thanks
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check oil level CAREFULLY, smell it, float needle in carb not sealing is my bet, gas continues to leak into cylinder, exits thru the rings into block or thru an open engine valve out the exhaust
 
SQUAREHEAD said:
check oil level CAREFULLY, smell it, float needle in carb not sealing is my bet, gas continues to leak into cylinder, exits thru the rings into block or thru an open engine valve out the exhaust
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Thanks for the suggestion. I will check the the oil like you suggest. float valve sounds like it may be the problem. I will reply when I have checked it out.
 
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