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Tank Vent?

Old 11-29-2020, 12:30 PM
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Default Tank Vent?

I have a five-year old CC with a 100 gal. tank, and it appears the tank vent is not working. When fueling, the fill nozzle will cut off, and gas can be seen in the fill spout; yet the tank is not full. The gage shows from 60-80% full. At first I thought the gage was not working, and I had more gas than shown. But after running empty, in darkness and a violent storm, it was apparent the gage was telling the truth. Another clue, sometimes when the cap is opened, air will belch out as if trapped in the tank.

The boat manufacturer has agreed to work on it, but it will be weeks before he can get to it. So in the mean time, I am trying to go out 50+ miles, carrying spare cans of gas but wondering how much do I really have. I've tried driving around hoping that shaking the boat might relieve the air-lock? ' tried waiting several days. Also tried blowing through a straw into the vent (which exits at the fill spout)....all to no avail. So my question is is there any way to relieve the air-trapped in the tank so as to fill the tank? Or is there some other problem potentially causing these problems?

Thanks
Old 11-29-2020, 01:29 PM
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I'm guessing that you have a newer boat made in the last 10 years in which case it's probable that you have a carbon canister in the vent line and if that carbon canister is subjected to fuel or water it will become plugged. It is probable that you could locate that canister and replace it with a dummy nipple until the builder can rectify the situation but it will require that you become more familiar with your vessel...
Gerald
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Old 11-29-2020, 02:01 PM
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Thanks Gerald. Actually accessing the vent/filter will involve removing my leaning post/bait tank which will be quite an ordeal...32 gal. tank and plumbing, cabinet with three trolling motor batteries, etc. One shop did a prelim estimate of $500(?). But you are probably right, there is no getting around it. May just have to wait on the factory. I was hoping someone had figured out a band-aide for the short term. And to think how this system is so much more complicated and vulnerable, just to capture some miniscule amount of fumes.
Old 11-29-2020, 04:12 PM
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I would expect the canister to be very close to the fill/vent, under the gunnel?
Gerald
Old 11-29-2020, 05:24 PM
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Pull the sending unit while fueling... just open it up a bit to let your tank breath.
Old 11-30-2020, 02:40 AM
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I just cannot access the sending unit, vent line or canister, as all that is underneath bait tank and leaning station...which is quite large. I thought about inserting a tube into the the fill hose? I'm guessing there is a check valve in the fill line that is holding the air in?
Old 11-30-2020, 09:08 AM
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Originally Posted by Reel Team View Post
I just cannot access the sending unit, vent line or canister, as all that is underneath bait tank and leaning station...which is quite large. I thought about inserting a tube into the the fill hose? I'm guessing there is a check valve in the fill line that is holding the air in?
It's more likely that there's just a low spot in the hose, if you trailered the boat you might be able to drop the bow down a little (disconnect from the truck ) and improve its ability to take on fuel...
Gerald
Old 12-01-2020, 03:29 AM
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Having now read through dozens of threads on similar situations, I have learned much about the tank system including the vent; ' way more complicated than I imagined. And I will try tilting the trailer...someone said raise the side where the gas fill is. Another said to shake the boat while filling. And as Lyman suggested, gonna make an attempt to reach the sending unit or vent line at the tank. ' not going to insert a tube in the fill hose...and risk getting caught in check valves. Gotta figure out something as grouper season ends in a month.

But it is hard just to imagine they are still building good boats with this Achilles heel, potentially contributing to running out of gas offshore, its a bad problem.
Thanks for the suggestions.
Old 12-05-2020, 04:17 PM
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I was going to suggest a tube inserted into the fill line also. I never heard of a check valve in the fill line. You could always try to snake something down the fill line first to see if you could actually get something down there.

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