CD 25 fuel tank vents

M

Minnow

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C Dory Year
2004
C Dory Model
25 Cruiser
Hull Identification Number
61
Vessel Name
Minnow
The CD 25 now comes with an aluminum 107 gal fuel tank with fills and vents on both sides. Occasionally I'll get a whiff of gas, from the vents presumably. Do you think flow-through ventilation is a good thing for a gas tank?
 
What about condensation? Do you suppose thats how all the water got in my tank?
 
No sir. On a live-aboard boat one goes through great lengths to ensure that there is complete cross ventilation in the boat. Especially offshore cruising sailboats and any boat in Southern waters. Why? To control condensation. Warm air has the ability to hold more moisture than cold air; if it has a way out it carriers the moisture away with it. If it's trapped, when it cools the moisture falls out in the form of condensation. Ventilation is good as it allows air movement and helps control condenstaion. On your fuel tank it also allows for better filling as the offside vent does a good job of allowing the slightly pressurized air in the tank during filling to escape (better than the vent nearest the filler you're using).

I believe that the water in your tank came from either one or both of the deck fill caps being loose (especially during the trip across country), from the tank sitting outside before installation with a protector missing from one (or both) of the fill hose or vent hose nipples (rain intrusion), or from perhaps a high pressure hose (during a cleanup session) being aimed toward the vents (I think this the least likely as it would take a long time to get much water in the tank).
 
Les probably has a better answer but I'd opine that the water was not condensation. Unless the tank sat nearly empty for a long time. Tanks like to be full and they like to have things like stabilizer and "dri-gas" added occasionally. Would take an awful lot of condensation to affect things. Now if there were only 5 gallons in that 107 gal tank for a long time and the metal tank was cold when it warmed up :hot :hot on the outside it may have some affect.

Could someone have done some tank cleaning and not drained it all the way? Or put water in by mistake? With two filling locations, you should ensure both are clearly marked "FUEL" and ensure some idiot at some marina doesn't put diesel :crook :cry or water :smilep :smilep in there instead of gasoline.
 
Dang, and it's only 6AM on the left coast. Thought sure I'd beat him to an answer. Good morning Les!! :lol:
 
Then again, it could be that ugly UnoAvril Vortex Effect :roll: whereby that big Honda 150 is sucking up water in it's cooling system, porting it by reverse osmosis tangifraction :?: :?: through the fuel pump and into your gas system and thereby into the fuel tank.

If the fuel tank seems to be getting more full the longer you run this is sure to be it!

Happy April 1!
 
Darn! I forgot all about that April 1st stuff! I coulda had a good time! :shock: Except I don't want Brady to get worried and leave! :lol:

Mornin' Cap'n :thup
 
Les, you still gots nearly 16 hours left to pun it up. How's that dusty dad of your'n? We sure got lots in common, Navy, Ham Radio, etc, etc. Bet he's got more hair than I have tho!

charlie
 
OK then Les, how about the fact that all cars have a pressure/vacuum regulating gas cap to prevent air pollution. For those of you who care about the environment, (I don't have kids and live in New Jersey), it seems that if the gas is oxidizing and evaporating, it isn't getting any fresher. I think I will plan to cap one of the vents, (the side with the barbeque grill), except while filling, any harm in that?
 
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