tank vents?
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tank vents?

  1. #1
    I'm No Expert Shaun's Avatar
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    Default tank vents?

    I have the standard $30 flip fuel fills and venting... How do i vent my tanks if i wanted to. My tanks have plenty of plugged holes in the top of them but what do i need to do so that i dont get fuel pooring everywhere..
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    Senior Member Brendellajet's Avatar
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    You can buy a new set of vented caps. Another fix I have seen is drilling a small hole in the cap. There may be a way to retrofit your caps with a legit setup.

    Or, google fuel tank vents. If possible I would vent the tanks outside the boat. No need to vent into the hull and risk potential fire. Pretty sure you can run the vent with some hose to a through hull fitting. Caps are a lot easier.
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  4. #3
    gn7
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    http://www.glenwoodmarine.net/ go page 11 item#405 this is the one I use, have never trusted the ones in the cap to vent well enuff. You can get these thru Rex.



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    TJS
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    I am machining ones right now. I do not like the ones on the market. They look as if they will "injest" water when mounted straight up. I am trying to make them so the water will have a harder time getting into the external vents.
    T.J.
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  7. #5
    gn7
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    what do you mean by "STAIGHT UP"? there is a little hole in the thing and it's suppose to be pointing down.



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    TJS
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    The ones like these. I do not want to drill a hole in the side of the boat. No way. So if you mount these above the tanks near the fillers then they would be "straight up" on a horizontal surface of the boat. That is what I mean.
    T.J.

    http://www.westmarine.com/webapp/wcs...78&classNum=90
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  9. #7
    I'm No Expert Shaun's Avatar
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    I'm not drilling any holes in my boat. gn7 does that vent have a fuel stop, i want somthing that will keep fuel from comming out but allow air to come in. I cant really find anything like this.
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    Senior Member Widetrack's Avatar
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    Quote Originally Posted by Shaun View Post
    I'm not drilling any holes in my boat. gn7 does that vent have a fuel stop, i want somthing that will keep fuel from comming out but allow air to come in. I cant really find anything like this.

    Shaun one thing to do is put a loop or two in the vent hose this helps on the full tank sloshout blues! WT

    Coby
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    Senior Member Brendellajet's Avatar
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    Quote Originally Posted by Widetrack View Post
    Shaun one thing to do is put a loop or two in the vent hose this helps on the full tank sloshout blues! WT

    Coby

    Do this with the through hull. Venting inside the hull is dangerous.

    Or, get a set of venting caps from rex. I ran 800 HP with a set of Rexies billet caps and had no probsl on 2 15 gallon imco tanks.
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  12. #10
    Distinguished Member David 519's Avatar
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    Quote Originally Posted by Widetrack View Post
    Shaun one thing to do is put a loop or two in the vent hose this helps on the full tank sloshout blues! WT

    Coby
    I've done this with both rubber hose and also 3/8" SS tubing, a couple loops then run the vertical section underneath the gunnel. I never had any fuel inside the boat or noticed any fumes. Brendelljet makes a good point that the fumes could be dangerous venting inside the boat. However, with a flat where everything is out in the open and a LOT of wind going past the engine, I never had an issue.
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  13. #11
    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by Brendellajet View Post
    Do this with the through hull. Venting inside the hull is dangerous.
    Or, get a set of venting caps from rex. I ran 800 HP with a set of Rexies billet caps and had no probsl on 2 15 gallon imco tanks.
    Which ones are you talking about? My fliptops are from rex.


    Loops would work i guess, but it's possible of having fuel stuck in one of the loops but i guess it would be sucked back in. I would dump the vent out a dump but i dont like the idea of there being a direct lines from the water to my fuel.


    I'm not sure venting is really my problem, i pulled the fuel line and ran the pump for a good 30 seconds pooring fuel into a can and it was pumping plenty of fuel and didnt look to have any problem. Course thats flow and not pressure, i suppose if the tank had a vacum it could cause the fuel pressure to drop and not push fuel fast enough into the bowls?
    Last edited by Shaun; 05-20-2008 at 03:54 PM.
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  14. #12
    Senior Member Brendellajet's Avatar
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    I went with these. Pricey but nice.



    Try sucking on an empty water bottle if you have one laying around. That should show you why you need to vent the tanks.

    You gonna run elsinore this weekend? I should be out on Sunday.
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  15. #13
    I'm No Expert Shaun's Avatar
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    No, i understand why i need to vent the tanks if the flips i have now are not adaquite but what i'm getting at is that the pump doesnt seam to be having a issue pumping a ton of fuel, way more than i would be using at WOT for a 30+ seconds with out seeing a noticable change in the flow... What i was also getting at is that flow looked good but maybe pressure is what was being affected.

    I wont be at elsinore this weekend, i'm heading up to sandbar resort (formally known as redrock) in parker this weekend.

    I'm going to set the floats correctly before i go adding any extra venting and run it this weekend and see what happens.
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  16. #14
    I'm No Expert Shaun's Avatar
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    Brendellajet, Those fuel fills look pretty cool but i dont think they will work for me. Whomever drilled the holes for my gas tanks did it way too close to the lip that comes up on the hull. I had to shave alittle off the bottom of the flip tops on one side to get them to sit flat and not have a huge gap.
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