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Gas Smell
Posted: July 2nd, 2020, 11:32 am
by Struggler
I’ve searched for this topic and have some ideas based on posts that I’ve found, but wanted to throw this out here....after running, I am smelling gas. Not after fueling. I’ve looked at fuel fill lines and vent lines and don’t see visible gas/moisture. Poked around fuel lines to the carbs and don’t see much.
Could it be just the gas in the carbs that I’m smelling?
I’ve let the blower run for 30 minutes or so after shutdown which I think helps a bit. I plan on idling 1 engine at a time to try and isolate which side it’s coming from. 85 Mariner with Crusader 220’s.
Thanks
Re: Gas Smell
Posted: July 2nd, 2020, 3:51 pm
by bud37
The thing about gasoline fumes is they can permeate dry rotted fill hoses etc and then you smell the gas fume but there will be no visible indication....you will have to bend lines at joints to look for cracks etc.
Also most humans can smell gas fumes in very tiny amounts PPM, so it really does not have to be much of a leak.
Is this something that just started or been getting worse. Be very careful while you look for the source of this.
Re: Gas Smell
Posted: July 2nd, 2020, 4:52 pm
by vtcats
Struggler wrote:Source of the post I’ve searched for this topic and have some ideas based on posts that I’ve found, but wanted to throw this out here....after running, I am smelling gas. Not after fueling. I’ve looked at fuel fill lines and vent lines and don’t see visible gas/moisture. Poked around fuel lines to the carbs and don’t see much.
Could it be just the gas in the carbs that I’m smelling?
I’ve let the blower run for 30 minutes or so after shutdown which I think helps a bit. I plan on idling 1 engine at a time to try and isolate which side it’s coming from. 85 Mariner with Crusader 220’s.
Thanks
In my prev boat,gas powered Carver 396, I smelled gas initially after filling (course that was over 10 years from new), but it continued to get worse so even after running the boat, I could smell it. Turns out the fuel fill lines needed to be replaced. If you don’t see a leak in a tank, I would bet it’s hoses and as Bud37 said, you typically can’t actually SEE the issue in a fuel line unless bent.
Re: Gas Smell
Posted: July 2nd, 2020, 7:05 pm
by Struggler
Thanks! I will replace the vent and fill lines to eliminate that possibility. Bud37....the boat is new to me and has been sitting for a few years. Just had carbs rebuilt and engine work on it to get it seaworthy, so I don’t know if it’s new or what LOL. The mechanic did not add gas during/after the maintenance so fill line issues could have been missed.
Re: Gas Smell
Posted: July 2nd, 2020, 9:29 pm
by Viper
The tank lines should be checked, and have you checked the small clear line from the fuel pump to the carb? Also, pull your dipstick and smell the oil to see if it smells like fuel.
Re: Gas Smell
Posted: July 2nd, 2020, 10:52 pm
by Struggler
Viper wrote:Source of the post The tank lines should be checked, and have you checked the small clear line from the fuel pump to the carb? Also, pull your dipstick and smell the oil to see if it smells like fuel.
I will check that tomorrow.
Re: Gas Smell
Posted: July 3rd, 2020, 6:50 am
by Viper
That line is supposed to be clear so you can tell if there's fuel in it. If you see any fuel in there, replace your fuel pump.