Fuel vapors eat paint??
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Fuel vapors eat paint??

  1. #1
    DEG
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    Default Fuel vapors eat paint??

    Had a jetboater come by the shop today to check out my paint, and he told me I should vent my gas caps because he had one painted and under a cover on a few hot days the gas vapors creeped along and ate up he's paint job..
    I know my caps are vented now.( just the stock ones) and I've never heard this on a boat before has any one else?
    He told me to drill a hole in the side of the filler under the gunwale and run a hose to the side of the boat at water line.
    Last edited by DEG; 03-25-2013 at 11:00 PM.

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    heck yeah it can. (pix from rdp)











    took it all the way down to the primer.


    vent your tanks!

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    Bass Lake Dream'n "Flat" foot'n's Avatar
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    Or maybe just don't store it with full tanks? I have had this happen but it only destroyed decals. Since then I try to park the boat with no more than 1/2 tank. If I have to I'll siphon gas into my tow vehicle.
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    Senior Member johnf's Avatar
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    I like the idea of vent coming from filler neck! Never seen that. I have heard horror stories of tank vents (coming from top of tank) collecting fuel and spilling on to paint,and gell and messing it up. Would wonder about vent at water line though??? I'd put it as high as I could discreetly somewhere on the hull.

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    I do not think it is the vapors, usually parked with full tanks then sun warms and expands the fuel and it overflows out the tank vents at the cap. The gas then has a chance to set on the paint and eat it away, never park with full tanks!

  8. #6
    DEG
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    WELL CRAP!!
    Taptaptap--- thinking..
    I really don't want to put a hole in the side of the hull! I don't see that fixing the problem just moving it. In the pics, that's more spillage then vapor. How about tapping a line from the top of tank then vent somewhere else? Carb?

  9. #7
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    Pretty sure the only way it will push fuel out of the cap is if the fuel level covers the bottom of the fill pipe. It creates an air pocket and when air in other parts of the tank expand from heat it pushes fuel up the inlet pipe. If i shove the fill handle all the way into the tank when i get fuel and let it stop on its own as long as the boat is parked at same angle it won't leak.
    I usually fill on the way to the ramp anyway....And i am pretty sure if i filled up and launched on a hot day and didn't run a few miles and use some fuel the angle of the boat in the water would push fuel out of the cap if i just parked it.
    Can't see putting a vent anywhere in the tank other than the cap, there is no good place to leak fuel. Overfilling a tank is never a good idea.......ie fuel in the fill pipe
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    This has always been a very ugly problem. When I worked for Sanger Boats, these type of problems we're always coming back for repairs. Two ways to fix the problem. If its a ten gallon tank, you only put 8.5 gallons in it. Gas will expand to over a gallon in extreme heat. Like out at the river. AND NEVER, and I repeat NEVER, unhook your boat with full tanks & leave it bow down...COVERED!!! Big mistake.. gas comes out, runs to the bow & down the sides & you have one big mess.

    One problem no one is addressing, or maybe your not aware of. Gas damage like this never really goes away. Fiberglass is like a sponge. The vapors get trapped in it. Even though the paint & any glass damage can be repaired to the eye, when it gets warm out, or after time, the area affected will show to some point. Shrinkage, or you might even be able to see where it was, but not feel it. I always use the best products, especially with stuff like this. Time between steps is critical. The more time you leave the damaged area exposed after sanding the better. I always flush the area with water for a couple of days trying to flush out any contaminates & or vapors. Then preceded with the primering stages. Saw the Spectra at the Needles event this yr. Very nice & pretty boat...

    After seeing so many like the the pics of the Spectra, & fixing a lot these, I did a different deal on my own personal Sanger. Ordered it with the side tanks. No fills drilled on the deck. When I rigged the boat, I put a fitting on top of both tanks (.-10) and then installed a 1gal puke tank at the transom to fill both side tanks from k
    there. I should of used a bigger line (-16). It looked very kool. Tank was chromed, fittings the kolor of the boat, and it worked. Both tanks were vented thru this puke tank and no more holes were drilled in the hull.

    Sorry about the long winded post. Hope this helps you guys out...
    Last edited by Billy-B; 03-28-2013 at 07:55 AM.
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    DEG
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    Thank you-- for everyone's posts.
    The leaving the nose up when stored is the normal in Washington, we can get some rain in these parts.. Lol and my tanks are always empty, I hold the record for the most towed in because of forgetting to fill up, or the old saying I got plenty... Lol

    Has anyone run the flush type cap? Are these vented too? Or does anyone know of a sealed cap? Thinking of venting from a remote area like on my supra. Works really good on it..

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    Senior Member SHAWN DAVIS's Avatar
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    Just got my Cole fixed from what Billy said, fuel down the bow, ate the paint.

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    DEG
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    Follow up- I ordered some cam lock deck fills and I'm running a vent off of the neck. Does anyone have a good idea where to run this line???

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    DEG
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    Anybody have any ideas where I can run the vent tube too? I've seen guys do this before but have never paid any attention to where they vented too..

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    DEG
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    Bump

  16. #14
    Senior Member Billy-B's Avatar
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    There are several different ideas I have seen. Some will vent towards the transom, some towards the mid section, some literally just get a longer line, coil it up & hide it underneath the gunnel. Just don't vent it underneath a engine hatch or any place where vapors can hang & cause an explosion from a spark. Like when starting your engine.
    N.R.K.A. CEO of the Needles River K Association.....The largest "K" boat assoc in the WORLD. 30 boats strong & growing.

    And the #1 backer of " EASON " for President.




    "Blown Gas Flats to the ramp!" - Chris Blevens

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