New 6 gallon boat fuel tank

I noticed the new tank I bought is not vented. It blows up like a Ballon and floods my motor, a quick search shows me new tanks are not vented.
Can I buy a vented cap for my new seasense 6 callon tank or is there a inline vent I can run to relieve pressure. If I crack the lid its good but I cant rip around like that it’ll spill.

for 1/3 the cost of the new tank they will sell you this super handy “how they always used to be when things worked” old style manual vent cap.

Yeah its kind of dumb having a non vented tank. I thought something was wrong with my motor. But playing with the tank it ended up being the pressure it was creating

Bearcat89 wrote:

Yeah its kind of dumb having a non vented tank. I thought something was wrong with my motor. But playing with the tank it ended up being the pressure it was creating

With the new EPA regulations portable fuel containers (which includes portable boat tanks) are not allowed to vent to outside atmosphere. They will vent once the pressure reaches 5 psi.
As to problems with your motor, are you pushing the pressure release on the tank before 1st hooking the fuel hose to your motor? There should be a red inner knob in the center of the tank cap.

Turned all the way clockwise, closes the vent valve in both directions, (no air flow in and no airflow out)

Turned all the way counterclockwise, the vent valve position only allows air flow into the tank (to replace the fuel being drawn out of the tank).

Momentary pushing in on the knob (when turned fully counterclockwise) releases any pressure buildup in the tank.

It is recommended that the fuel line going to the motor be disconnected when the boat is not being used. This prevents any built up tank pressure from flooding the carbs. Again, one needs to relieve any tank pressure before 1st hooking up the fuel line for the day and initially starting the engine.

There is no release on the tank in any form.

Cody Meyers wrote:

“how they always used to be when things worked” old style manual vent cap.

Now, with the new non-vented fuel containers, I can walk into my garage and not be overcome by gasoline fumes. How many folks actually closed the manual vents? I know I never did. Always had a bit of gasoline seeping out from sloshing around.

Huntindave wrote:

<div class=”d4p-bbt-quote-title”>Cody Meyers wrote:</div>
“how they always used to be when things worked” old style manual vent cap.

Now, with the new non-vented fuel containers, I can walk into my garage and not be overcome by gasoline fumes. How many folks actually closed the manual vents? I know I never did. Always had a bit of gasoline seeping out from sloshing around.

I used to open and close my vent daily on my last tank. I though I was upgrading. But in fact now have a new tank that’s causing issues

Bearcat89 wrote:

There is no release on the tank in any form.

This is the cap on a tank new this March. Apparently your cap is not made exactly the same.

Regardless, if you are disconnecting the hose to the motor there is no way it can flood the carbs. Crack the cap to relive pressure, close the cap, hook up the hose and you are on your way. No need to drive around with the cap open, the cap on your tank is designed to allow air flow into the tank.

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Huntindave wrote:

<div class=”d4p-bbt-quote-title”>Bearcat89 wrote:</div>
There is no release on the tank in any form.

This is the cap on a tank new this March. Apparently your cap is not made the same.

Regardless, if you are disconnecting the hose to the motor there is no way it can flood the carbs. Crack the cap tp relive pressure, close the cap, hook up the hose and you are on your way. No need to drive around with the cap open, It is designed to allow air flow into the tank.

No my cap is nothing like that. My point being even when I’m out and sit and fish for 20 minutes, then my tank will expand and when I go to fire up the motor it’s flooded. No one wants to unhook the fuel line every time I stop to fish for 20 minutes or fiddle with the cap.
Hence the reason I was asking about replacement caps with vents

Bearcat89 wrote:

No my cap is nothing like that. My point being even when I’m out and sit and fish for 20 minutes, then my tank will expand and when I go to fire up the motor it’s flooded. No one wants to unhook the fuel line every time I stop to fish for 20 minutes or fiddle with the cap.
Hence the reason I was asking about replacement caps with vents

Good luck in your search. Not sure how a manufacture would bypass the EPA regulations. FWIW my tank is a Moller tank, have no idea if a cap from Moller would fit the threading on the Seasense tank you have.

I’ll sell you my old style 6 gallon tank for $200.
DT

deertracker wrote:

I’ll sell you my old style 6 gallon tank for $200.
DT

300 would be a better deal for both of us

There are all kinds of manual vent replacement caps on eBay and Amazon. Just go out and find the one for your tank. Simple process.

Bear, there are a couple ways to create your own vented cap.
some seal differently than others.
– removing a seal or just a portion of it
– Drilling a small hole like 3/32 or so in the correct spot or spots, just dont do it where water can pool and get in too easily during a rain storm.

If you take a good look at the cap its pretty easy to devise a plan to make it vented.

Bearcat89 wrote:

<div class=”d4p-bbt-quote-title”>deertracker wrote:</div>
I’ll sell you my old style 6 gallon tank for $200.
DT

300 would be a better deal for both of us

Only $195 here – – I have 10 of them.

I have 8 rental motors (6/8hp Johnson/Evinrude). I noticed a few years back OMC changed to a not vented cap. That was an issue, especially for inexperienced boaters. Then I found out a new OMC replacement cap (with a vent) cost more than an entire tank at FF or Wally World. I ended up scrounging all the vented caps I needed from rummage sales, curbside garbage to be picked up, etc.

Unlikely I will part with any.

TheFamousGrouse wrote:

There are all kinds of manual vent replacement caps on eBay and Amazon. Just go out and find the one for your tank. Simple process.

I’m not sure it is as simple as that. The new tanks that I have encountered have a different thread size for the cap, than my older tanks.
as an example note the specs from this Amazon ad;

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TheFamousGrouse wrote:

There are all kinds of manual vent replacement caps on eBay and Amazon. Just go out and find the one for your tank. Simple process.

I tried looking right away for one for this new seasense tank. Can’t find one that matches for those threads. Other wise I wouldn’t have asked.

Bearcat89 wrote:

and floods my motor,

Bearcat,
If flooding your carbs is the issue, you don’t have a vent problem. Sounds like what you need is a “demand valve” https://www.westmarine.com/buy/west-marine–fuel-demand-valve–13854252?cm_mmc=PS-_-MSN&msclkid=3e532fb3e0a419569d5f4f30eda9ffae

Product Overview
Prevent engine flooding that is a result of new EPA required closed fuel systems.

EPA requirements for portable fuel systems no longer permit vapor emissions or ventilation into the atmosphere. As a result, these closed systems can build up pressure in the tank that forces fuel into the engine causing it to flood and leak into the water. West Marine Fuel Demand Valves (FDV) control the added pressure in these systems and eliminate engine flooding and potential fuel spray while connecting and disconnecting fuel lines at the engine. The fuel demand valve can hold up to 5psi of pressure and allow the engine to draw only what it needs without impeding normal fuel flow. To address similar pressure issues at the tank, we recommend the installation of a sprayless connector and fitting at the tank end.

Key Features

Prevents engine flooding caused by added pressure in ventless fuel systems
Controls pressure to eliminate risk of fuel spray when connecting and disconnecting fuel lines at the engine
Allows engine to draw at normal fuel flow rate
Compatible with ethanol blending fuels
Fits 5/16″ and 3/8″ fuel hose

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I found a vented cap at fleet farm and did exactly the trick. Thanks every one

I think I have the same issue, which cap did you find at FF? In the marine or automotive section?

onestout wrote:

I think I have the same issue, which cap did you find at FF? In the marine or automotive section?

This was in the marine section. But if you have Amazon I would ho that route. Probably save you money.

I found a pile of them by 169….sorry couldn’t resist Ron 😂