Boats For Sale:
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BFN Bob 
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Joined: January-20-2025 Location: {Phoenix Status: Offline Points: 3 |
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 Topic: Gas ventPosted: January-26-2025 at 2:23pm |
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on my 1988 BFN, the gas tank vent...when its gets hot (Arizona) and the tank is full, gasoline expands, and drips out the vent onto the swim step - and not good for the teak. and puddles on the ground (not safe) Any solutions boys?? thanks, Barefoot Bob.
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BFN Bob
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11162 |
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Posted: January-27-2025 at 7:33am |
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Sounds like the vent is doing what it's supposed to do and you're filling it too much, unless there's more to the story.
One solution......put less gas in the tank
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Air206
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Joined: September-28-2008 Location: Roanoke, VA Status: Offline Points: 3004 |
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Posted: January-27-2025 at 9:09am |
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Bob, I’ve known some vents that just spill gas. Not necessarily user error, Ken.
You can go behind the seat and look at the tank and vent/hose. Make sure there’s no loop, low point, kink etc. They used to make a vent line whistle. I had them in my old boats. Made filing super easy. When the whistle stops… stop fueling. Great for filing on the water and on the hard. The whistle allows the vapor out but not the fuel. It may work as a catch for fuel loss if your lines are ok and if you can find one. (I might have an old one in my stash?) |
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KENO
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Posted: January-27-2025 at 9:58am |
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63 Skier
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Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4277 |
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Posted: January-27-2025 at 10:16am |
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I agree with Steve, look at how the vent hose is routed, want to make sure it's out the top of the tank and straight to the vent, no ability for gas to stay in the hose.
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'63 American Skier - '98 Sport Nautique
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Fl Inboards
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Posted: January-27-2025 at 11:02am |
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Nautique parts offer a surge protector. https://nautiqueparts.com/fuel-surge-protector/ when installed it may restrict how fast you can fill the tank at the pump. Another thing is to check and make sure the vent hose is properly routed and attached so as that there is a higher then fitting attachment that allows fuel to flow back to the tank and not out the vent. zip ties that hold these or even plastic retainer will degrade and allow the vent hose to ride on top of the tank. this situation will cause the issue you are experiencing also.
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Hobby Boats can be expensive when the hobbyist is limited on their own skill and expertise.
1993 Shamrock "fat" 20. 2008 Nautique 196 5.0 |
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Riley
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Joined: January-19-2004 Location: Portland, ME Status: Offline Points: 7960 |
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Posted: January-27-2025 at 1:15pm |
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Cracking the gas cap will stop it.
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desertskier
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Joined: December-19-2006 Location: Az Status: Offline Points: 1117 |
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Posted: January-27-2025 at 2:11pm |
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Mine does the same. I only fill it before we take it out. I never store it with a full tank.
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92 SN - Owned since 93
99 Pro Air 89 SN - Went to live on a lake in Texas 75 Donzi 16 - Sold in 93 |
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BFN Bob
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Posted: January-27-2025 at 4:56pm |
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In summer we leave at 3:45 am to ski (before the Wally's arrive), So we fill up on the way home ready to go next out. I could leave the cap "cracked" but if it rains ...water could get in the gas tank
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BFN Bob
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63 Skier
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Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4277 |
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Posted: January-27-2025 at 6:47pm |
I think I'd rather ski at midnight.  I feel like, if the vent line is properly routed upward and outward, no trap of any kind in the line, then the only way gas expands and flows out the vent is if you've filled to the very top of the fill tube, like the last 5 clicks to just get that last quart in. I'd double check your vent routing, then fill just a few inches lower in the tank. Most of us ski with less than half a tank, not sure of your day and how much fuel you have when you're done but seems like that would solve it. |
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'63 American Skier - '98 Sport Nautique
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TRBenj
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Posted: Yesterday at 8:03am |
In my mind, this is key… there needs to be a high point for the vent line- usually zip tied to the underside of the deck, as Jody mentions. If that high point of the hose is higher than the tank level when the gas pump kicks off, then in theory, you shouldn’t get gas spitting out of the vent. As for gas expanding due to temp variations, I’m not sure there is anything that can really be done- if the tank is full and then the gas expands, it’s going to come out of the vent even with a high loop… only solution that comes to mind is to leave it a little short of full when filling to account for the expansion. |
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BFN Bob wrote: