Fuel tank vent

[SteelHead]

I just replaced the motor on my '92, 21' Explorer, it is 2001 150 Merc. Saltwater. carb model . I read that the vent to my tank is obsolete ,and I am introducing water through the air going into my tank . If this is true what should I do to fix this problem . I took the tank out after I replaced the motor and had it flushed, there was about a pint of water and black specks also . I replaced the fill hose and the feed line to the new water separator, the primer bulb and hose has been replaced too. My question is, Do I need to put some sort of valve on my vent hose and where should I put it ?   

[wingtime]

What does the vent look like?  The Genmar boats used this style:



If so you can get it here:  http://www.replacementboatparts.com/elbowwhiteplasticflutedtankvent.aspx

[Capt. Bob]

Old style?

[SteelHead]

Capt, mine looks the same as yours , I don't know if that is open to the environment or like the special vents on portable tanks

[SteelHead]

https://www.quicksilver-products.com/en/products/marine/outboard/fuel-systems/fuel-tanks/     Does the permanent under deck tank need a vent like the portable tank has ?

[SteelHead]

Maybe I'm trying to over engineer something that should be as simple as a tank vent . I know my tank is not pressurized, but maybe it should be ?  I am trying to eliminate any contamination by water (moisture) in the tank . The boat sits on a mooring all summer in the Bass River ,CC.

[Capt. Bob]

The venting system on our boats is old school. That new vent system on the portables is to save the whales (and us) from breathing the fuel vapors. Mine faces down and appears to get little/no water while underway. Still functions correctly (though not "green") after 25 years. I redid mine about 6 years ago and have a loop in the hose just before the vent to act as a water "trap". Seems to work fine. Keep mine on a trailer though.

Good luck.

[wingtime]

Permanently installed tanks just need a vent.  NOT pressurized.  Some small outboards use crankcase pressure to pressurize the portable fuel tank to force fuel up to the motor. (no pump).

Also EPA has come out with some crazy requirements for gas cans and portable tanks.  Some of them are just downright ridiculous and a pain the A$$ to use.

[SteelHead]

  Thanks Capt, and Wingtime,  I guess the original vent will work just fine, I will deal with the water in the gas  like I have been, with additives. Thanks again !