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Old 07-13-2016, 07:38 AM   #11
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Same problem with my 35' only the port side which tends to blow back. I would appreciate a fix thanks.

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Old 07-13-2016, 07:48 AM   #12
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I've been thinking about this relating to another issue and what I'm going to check on mine is if there's any water in the loop of tube for the vent. This might create a vacuum.

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Old 07-13-2016, 07:11 PM   #13
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Thanks I will be away for a week will have a look when I get back could be something that simple.
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Old 01-27-2017, 08:18 PM   #14
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I have a 4600 SCB and drilled out the thru hole vents. Despite never filling all the way up, I regularly get multiple 2-3 foot high "geysers" of diesel fuel suddenly spraying out out while fueling, in rapid succession, with no warning, while filling up. I have learned to "listen" as I am filling and back off, but sometimes its too late. I have even gotten drenched in the process. One time this happened while there was an EPA breakfast at the marina I was filling up at. I handed out $20 bills and cups of dish soap to some guys with small boats and asked them to go churn up the water to disperse the huge slick. This is not good. Despite being able to minimize it, it still happens on occasion without warning. I do plan to replace all of my thru hulls. Somehow I dont see that addressing the issue, as I did drill out the existing ones.
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Old 01-27-2017, 09:42 PM   #15

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I guarantee it will be blocked vents. When I bought my 4600 it took ages to fill up the water tank. As you describe I would put the hose in and start to fill up and would wait for the rumbling sound before I got the 3 ft geyser you mention.

It wasn't a problem with the water but when it started happening with the fuel that was an issue.

The starboard vents are accessible behind the sofa, there are 4, I think, bolts the hold the back of the sofa in place, remove the sofa back and then remove the ac vent, you'll see the vents behind there. You'll need someone on the outside to hold the vent and stop it turning. There was silicone on mine so a bit difficult to remove.

The port vents are down the side of the fridge, you will probably need to remove it.

Good luck.
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Old 01-28-2017, 03:11 AM   #16
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Location: N.Calif.
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I have the same problem with my 2400 SCR!
I am going to try a fuel fill ck valve in both the water and fuel tanks!
They fit in the fill hose at the tank!
If anyone tries it let me know how it works!
I am out of state and of line for several days so wont be able to get back to any replies until I return!
Thanks and good luck hope someone has success in finding a fix!
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
1976 16ft. Tahiti 2.5 IO (sold)
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Old 01-30-2017, 01:53 PM   #17

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Originally Posted by Portholme View Post
I've been thinking about this relating to another issue and what I'm going to check on mine is if there's any water in the loop of tube for the vent. This might create a vacuum.
The fuel vent loop goes ABOVE the vent, not below it. If water enters through the vent, it will rise the tube, then should drain back out again. It would be very, very difficult for water to enter, then rise up and around the loop to drain into the tank. If the loop were below the vent, then it would create a trap and any entering water would essentially block the vent and a vacuum would occur. If the loop is below the vent it was improperly re-installed by a owner doing DIY.

For those with this issue, I assure you it is the fuel vent itself. There is a screen on the inside. It corrodes over time and restricts the passages. Insects have also been known to make nests there. If not check whether there are any restrictions in the fill tube.
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Old 01-30-2017, 05:42 PM   #18
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You could use a shop vac on vent outlet. it should get anything out that could be clogging it including dead spiders.
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Old 01-31-2017, 10:27 AM   #19
Join Date: Jul 2015
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I have a similar but compounding issues with the water tank on my 3900 SCR that has me scratching my head. When I first bought it I filled it up with water and didn't think much about it. I went below and I found a huge hump I front of the couch. I peeled the carpet up and the tank had expanded so much that it ripped the plywood decking off the screws. I ran the shower and sink faucets to remove some water and it went down. I thought maybe the vent was clogged so I used my power washer and there must have been a muddober nest inside it. Now when I fill the water tank water will come out of the vent if it's overfilled. It will still bow up the floor below. I now use the aft shower head to drain it. The second more recent issue which may or may not be related is when the potable water breaker is on the pump seems to run a lot, and the water tank shows empty after a day. I cannot find any signs of a leak in the cabin, and the bilge seems normal (for some reason it always has some water in the bilge). Could there be a part on the toilet that is malfunctioning and passing water? The bowl does not show signs of water running. I am not a great mechanic, minimally adequate at best. I would like any pointers anyone might have. One issue is that I live 3 hours from the lake and any parts I need to make repairs I have to order and take with me as there is not a marine store nearby. I typically buy to many parts, get to the lake and spend a day working on it, and In the end either I didn't have the right parts, or I was completely off base with the problem. Expensive and frustrating to say the least. I hope I am posting in the proper place, if I am not I apologize, all help would be very much appreciated. Not just by me but the whole family that seems to be waiting on me to fix it.

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