Fuel system venting questions
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Fuel system venting questions

  1. #1
    Half a bubble off jrork's Avatar
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    Default Fuel system venting questions

    Hey guys. I’m redoing my fuel system and am curious what you all are using for venting of your tanks?

    I have a 18’ Brendella with two 8 gallon aluminum tanks mounted one on each side of the boat. They’re currently vented thru the flip fills but I want to improve on that so I don’t run the risk of burning down my new motor.

    This boat is so shallow that I have limited room above the tanks and in fact, the fuel fills almost extend down to the tank so I’m going to have to run a line to some form of a remote vent but I want to make sure it’s high enough that I don’t have the potential of fuel spilling out the vent and messing up my paint.

    Anybody have some suggestions or ideas? Pictures would be great


    Thanks a bunch……..john

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    Senior Member wajetboy's Avatar
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    john i have a tube welded to the top front of the tank to use as a vent. but i dont use them the vents in the caps work good
    1978 Southwind Tunnel Dragster/1980 SWTD center steer

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    Senior Member fleetimus's Avatar
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    John

    My vents are the small stainless pieces ot the top of the transom. They are run from the front of the tanks with a long ass hose. I get a little splash of fuel, but has not affected the paint. Call me if you want to elaborate.

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    Senior Member GT Jets's Avatar
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    John,

    I did a Renegade low profile hull some time ago and used the little aluminum bullet tanks, what I ended up doing for the venting was to drill and tap the fuel fills below the deck line and installed an AN6 fitting in them and ran the vent forward into a puke tank of sorts, the tank had a filter on it and was under the deck, a petcock made draining a piece of cheese, especially because there was never any fuel in them.

    In knowing now what I did not then, I would simply use a p-trap style vent (Attwood makes a nice one), but run them forward, not backward...And try not to "loop" the vent hose, if it becomes filled with fuel during a fill up it will burp fuel all over stuff....

    GT
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    Senior Member kdub's Avatar
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    I talked to a tech guy at Clay Smith Cams that has a blown nitrous deal in a TX-19 and he said he drilled .100" holes arond the perimeter of the rubber vent in the flip top fuel fills. That was his answer to the same question.

  8. #6
    Senior Member jetboatperformance's Avatar
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    If possible vent them overboard and "big" (you will be needin more fuel !!) might take some mods with your current set up unless you have extra unused tank fittings , call me or pm Grandpa i'll 'splain it to ya Tommy


  9. #7
    Senior Member GT Jets's Avatar
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    Here be those Atwood delio's (they work well).

    Just the cap shows outside the hull...

    http://www.marine-products.com/produ...eg-Black-or-SS

    GT
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    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

  10. #8
    TJS
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    I made these when I did the larger pickup project with my tanks I also added a fitting in the top of the tank as well and ran the hose with a smooth arc in it so when towing the boat with a full tank it is difficult for the fuel to find its way out onto the hull.
    T.J.








  11. #9
    Half a bubble off jrork's Avatar
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    Thanks everyone for the tips.

    Since I am pulling my tanks anyhow to weld in some new pickup and return fittings (TJ, will you please hurry up and move over here ) adding some fittings for vents seems like it would be cheap insurance (though I gotta admit, the flipfills have worked so far just fine) given I'm spending all this money on this new motor and I can't afford to be stupid and burn it down.

    So, if I was to add a couple of bungs up high at the front of each tank that would be the preferred location to have them welded in?

    Thanks again........john

  12. #10
    Member driptruck's Avatar
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    I would put them half way between the fill and the front of the tank or right by the fill if its near the front of the tank allready.(at least a foot from the end) I just figure if you hit the breaks hard while trailering the end of the tank gets pretty presureized. I have been thinking about this on my boat for a while because it sits pointing down on the trailer, so I can only put a half tank (absolute max) in while on the trailer or gas comes out the fills. I was thinking to get non venting fills and use a remote vent. I still probably wont fill it much more but I think that would keep from getting to the ramp with gas running down the side of the boat. What size line is recomended? I would like to do it over kill you never know someday I may be able to upgrade my motor

  13. #11
    Half a bubble off jrork's Avatar
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    That's a good point Scott. With all our hills around here its either running towards the front or the rear.
    As an alternative, a fitting torwards the front but the vent at the back like Tims setup?????

  14. #12
    Member driptruck's Avatar
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    Im not sure? But that seems smart.

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