When I purchased my used 2001 years ago, it had some water in the tank. I cleaned it out, but I guess I missed some. A small pin hole recently rusted through. I was going to POR15 it, but there just happened to be a used 2001 tank on ebay that was the right color (blue) at the time for a good price, which seemed a lot easier, so I bought that.
The new tank has a small extra fitting on the bottom (small curved barb towards right side of tank). It appears to be an overflow or maybe a vent? Internally this fitting is connected to a small tube that goes up to the top of the tank. Similar to the water drain fitting/tube, but this smaller tube doesn't exit the top of the tank, it stays in the tank.
What is this fitting for? Can I just cap this fitting and not use it? Or is there some benefit to this fitting since Suzuki saw a need to add it? (My tank is dated 11/2000, the replacement is dated 03/2001.)
20/20 Hindsight - if you ever have water in your tank, make sure you get it all out. Otherwise it will rust through eventually.
As a side note, does anyone have a need for a blue 2001 tank that needs to be rust treated internally? (Externally it is good except for some minor chips and the flake of paint missing from around the pin hole at the very bottom left side.) As noted this is an early tank without this extra fitting.
Thanks for any replies,
See this thread: http://gstwins.com/gsboard/index.php?topic=54739.0
Thanks for the link. I swear I searched first, but didn't find that. (You can tell I normally search instead of post by my low post count in all the years I've been a member.)
Okay, apparently this is a California tank and I can cap this extra fitting. For those curious, I used a small mirror and see that internally this small line runs to the very top of the tank, right next to the fill hole. At the top of the line is a small metal cylinder. I can blow in and suck out through this line, so it isn't a one way valve or anything. So, if you could possibly fill the tank above the bottom of the filler neck, gas could leak out this fitting. I'm sure it is some CA emissions think to suck the fumes from the tank and burn them in the engine versus seeping out the normal vent into the atmosphere.
You're right. That's what shows in the Haynes and Clymer books. It goes to a canister of stuff then feeds into the carbs.
If you don't have one of those books, it is good to have at least one of them.
Sounds like a Cali Spec tank
And a Calif. tank is a couple liters smaller than tanks for the rest of the world. Lord only knows why.