fuel tank venting

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fuel tank venting

Postby Regal Cicada » Sun Aug 31, 2008 6:53 am

I am not sure if my fuel tank is vented as during fill up, it gurgles and burps fuel. This isn't the safest situation or ecolocogically sound condition to let remain. Does anyone know if the 2120 Destiny fuel tank is vented? How would I spot the vent? If not vented, does anyone have experience with the installation of an aftermarket vent?
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Re: fuel tank venting

Postby SGilbert » Sun Aug 31, 2008 8:45 am

I has to be vented. Regal used a poorly designed Perko fill/vent combo for a time. Your could be one of them, as mine was.

I installed a separate vent line making sure the hose from the tank to the hull was constantly on an upward angle.
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Re: fuel tank venting

Postby Regal Cicada » Tue Sep 02, 2008 1:06 am

Thanks for the response. This may be a good winter project.
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Re: fuel tank venting

Postby elvis » Tue Sep 02, 2008 11:14 am

Hey, now that you mention it...

I am having a problem fueling. I have 2 fills (port and stbd), and one takes fuel substantially faster than the other. Both are slow compared to other boats I have owned. Basically, the fill tube will overflow unless I fill at a very slow rate. I have cleaned the caps on the vents, but no change. Is it likely that I have a blockage farther inside the vent tube? Is there a good way to clean this out?

Thanks.
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Re: fuel tank venting

Postby SGilbert » Tue Sep 02, 2008 12:51 pm

Blockage is possible, but unlikely. Removal & cleaning would be the preferred way if possible. Otherwise, try suction or a wire hanger after vent tube is removed from tank.

More than likely, you have an air lock in the vent tube. It needs to be as straight as possible with no vertical bends and a constant upward angle.

The larger the hull vent the better. That is why I added a dedicated vent to my hull to replace the Perko fill/vent combo.
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Re: fuel tank venting

Postby Leviathan1 » Wed Sep 03, 2008 6:08 pm

On our 3060, I had a similar problem until I rerouted the vent line to be higher than the fill line. This cured it as far as I know.
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Re: fuel tank venting

Postby elvis » Wed Sep 03, 2008 6:23 pm

Higher at the tank or higher where it goes thru the hull?
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Re: fuel tank venting

Postby 95RegalDestiny » Sat Feb 24, 2018 10:51 pm

I know this is a super old post, but I have the exact same issue with it puking fuel at fillup. I have the Perko filler that has the vent line attached. The filler/vent is already very high up on the boat. How much higher does the vent line have to be in order to be effective in stopping the fuel from puking out?
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Re: fuel tank venting

Postby gofast24 » Thu Mar 01, 2018 11:57 am

SGilbert wrote:Blockage is possible, but unlikely. Removal & cleaning would be the preferred way if possible. Otherwise, try suction or a wire hanger after vent tube is removed from tank.

More than likely, you have an air lock in the vent tube. It needs to be as straight as possible with no vertical bends and a constant upward angle.

The larger the hull vent the better. That is why I added a dedicated vent to my hull to replace the Perko fill/vent combo.

Just a aution on "sucking" the fuel tank vent hose out = Most likely that means putting a vacuum cleaner over the outside vent fitting to suction out he hose/fitting. In that case using a shop vac would be inviting a explosion as the vacuum cleaner motor has brushes that will always create sparks between the brushes and the commutator so just like a spark plug with a air fuel ratio that is needed to ignite the mixture?
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Re: fuel tank venting

Postby SGilbert » Thu Mar 01, 2018 2:05 pm

I DID say: "after vent tube is removed from tank."
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Re: fuel tank venting

Postby Rpontual » Fri Mar 02, 2018 7:16 am

elvis wrote:Hey, now that you mention it...

I am having a problem fueling. I have 2 fills (port and stbd), and one takes fuel substantially faster than the other. Both are slow compared to other boats I have owned. Basically, the fill tube will overflow unless I fill at a very slow rate. I have cleaned the caps on the vents, but no change. Is it likely that I have a blockage farther inside the vent tube? Is there a good way to clean this out?

Thanks.


My 35SC has a similar issue, the port side fill requires filling at slow rate. I inspected the fill hose and noticed that the starboard side one goes straight and down, the port side one has curves and seems longer. At least in the case of mine 35SC the issue is not related to venting.
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Re: fuel tank venting

Postby gofast24 » Fri Mar 02, 2018 11:04 am

SGilbert wrote:I DID say: "after vent tube is removed from tank."

Yes, sorry! Still wonder if there might be some fuel in the line that will end up in the vacuum's canister? Regarding the vents location ours are about 4" above the fill port. From the past I had a 24' Python and the fuel tank vent actually got blocked by "mud daubers" a type of wasp that built mud nests anywhere they could find a spot on the boat, in out case on the outlet of the tank vent!.
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Re: fuel tank venting

Postby Chris_in_Texas » Fri Mar 02, 2018 5:11 pm

If you can get to the vent line, its not that expensive to replace the whole thing and if the fuel fill line is original it might be good time to replace that as well. If its E10 fuel on that age of a boat it might be a good time to refresh those. ;)
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Re: fuel tank venting

Postby gofast24 » Sun Mar 04, 2018 12:15 pm

Chris_in_Texas wrote:If you can get to the vent line, its not that expensive to replace the whole thing and if the fuel fill line is original it might be good time to replace that as well. If its E10 fuel on that age of a boat it might be a good time to refresh those. ;)

If on E10 fuel might also be a good time to check all the fuel hoses on the boat! Happily our marina has Premium (92 octane) non ethanol fuel available and have ben using that exclusively since purchasing the 4160.
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