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Gas problem

J

John Schammel

New member
I have a 1998 40-50 HP 4-Stroke Mercury out board motor on my pontoon boat I bough last year (Aug 2010).* I was trimming the motor (Friday May 20, 2011)*to lock it down and I noticed gas coming out of the engine.* So I trimmed it back down and took off the cover to investigate.* I could not find where the gas was coming from at first but when I trimmed the motor back up I noticed the gas coming out of the air filter.* So I started to take the spark plugs out.* When I took out the #4 plug gas came pouring out.* My engine has carborators so I thought the*float valve maybe the problem.* But I had a simular problem when I was preparing my motor for this year.* When I started to prepare my motor for this year, I started to clean out the fogging oil from the clyinders.* When I removed the number one spark plug fluid came pouring out.* I though it might be gas but didn't know for sure.* I also changed the engine oil and found more oil than what was required.* Since the boat sat for several months I figured gas might have leaked through the pistons into the crank case.* Also,*one day I found the gas tank had expanded so much so that the cover*had raised off the pontoon deck considerablely.* At first I thougt somebody was tampering with my boat.* After I removed the gas cap and released the pressure the cover went back down to normal.* I have used the boat several times this year before finding the problem Friday and have used the boat again Saturday, May 21, without any problems.* This is the first boat I ever owner and I have no experience with boat or boat motors so if I miss speak please forgive me.* I was thinking the pressure in the gas tank might be the issue with the problems I am experiencing.* Could the pressure from the gas tank force gas through the carb into the pistons?* Could anyone share their thoughts or experiences on this problem.
*
Thanks,
John
 
I would have the local boat shop investigate this !-----------There appears to be a problem with venting of the tank.------------------The last thing you want is a " boooommmm and a fire " when you are on the water.
 
I have a vent in the cap of the tank but was told to keep it closed all the time. Is there a process on how to regulate the vent, like leave it open sometimes?

Thanks,
John
 
OK take the hose off the motor when not using the boat, so that high pressure fuel does not bypass the float valve.--------Who said to keep the vent closed on a " plastic tank " if I may ask.
 
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