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Posted by chief
- September 22, 2015, 11:04:53 AMThat is fairly typical of Drifters. It is venting as it is supposed to but makes a little racket when there is a lot to vent. Pop open the gas cap, close it back up and that resolves the issue until next time!.
Posted by Tfrank59
- September 22, 2015, 07:46:57 AMOK will do. Thanks.
Posted by gdrudd13
- September 22, 2015, 07:39:20 AMThere is a vent built into the gas cap. On the gas cap mount there is a small rubber gasket that coincides to a metal tube on the cap. Take off the gas cap and first run a wire or pipe cleaner or something through the hole in the tank. doesn't have to go all the way through, just enough to make sure there isn't any gunk. The easiest way to clean the cap is to take it apart. It's not hard. Just don't lose any of the pieces.
Posted by Tfrank59
- September 21, 2015, 09:36:37 AMOK also good info. None of my hoses are kinked – I've double checked it. But to test the gas cap vent, how would I do that? While she was singing slowly venting the other day, I opened the gas cap and the singing all of a sudden stopped. That tells me that it was venting, just not very fast until I opened it, right? At any rate, I filled the tank with ethanol free 92 octane, and I also put in some fuel system cleaner, and since that fill up I've run her about 75 miles and she's running quite good. I think if there were a problem with fuel flow I would've noticed it by now.
Posted by gdrudd13
- September 21, 2015, 08:42:30 AMOne thing you might try is to make sure that the vent hose isn't kinked, and also that the vent in the gas cap is working properly. Both could possible cause the issue you have.
The hose that goes to the evap cannister isn't actually a vent per se. It's for trapping fuel vapors that are collected and then one of the other hoses that was removed is for returning the now condensed fuel back to the tank. The thing the vacuum line went to is a pump that pumps it back into the tank.
Posted by Tfrank59
- September 19, 2015, 09:16:36 AMOK good info. I thought that was the deal because I saw I have actually two vent hoses going from the tank. Interestingly the desmog procedure that I followed (got from this forum) had me cap off a third tank hose – I think that went to the evap canister. I'm just curious because I've never had a bike that sang for me like that when she was venting 
Posted by Troll
- September 19, 2015, 09:04:44 AMQuote from: Tfrank59 on September 18, 2015, 23:00:05 PMWell, I got her back together with the baffles and back pressure now about where they should be, although I have nothing to compare it to
Still for what it is I think it's running good. After I kill it when it's hot, I hear the tank vent singing trying to suck more air into the gas tank than it can or maybe it's pushing out I'm not sure--I guess when it's venting it's pushing air out? (like an angry wife) Anyways does your guys tank vent make a singing noise? Elsewise I think my desmog went OK, the bike didn't quit or anything and it seems to be running pretty good like I said...
After the bike (or any vehicle) sits on a warm day, after it's been running up to temp, the system has to deal with expansion of fuel vapor. It's called "hot soak". If it DOESN'T vent, then you have a problem. The normal 49 state system vents to the atmosphere, and also has a vacuum vent to allow air back inside the tank as fuel is consumed. If it did not do that, too, you would get a vacuum lock on the fuel tank.
Posted by CDNRatMan
- September 18, 2015, 23:29:56 PMOn a hot day when I have shut down and am rolling the bike in or out of the shed I can hear it venting, and on a hot day when I move it or stand it up it vents.
Posted by Tfrank59
- September 18, 2015, 23:00:05 PMWell, I got her back together with the baffles and back pressure now about where they should be, although I have nothing to compare it to Actually what I've been comparing it to is my 1500 flat six Valkyrie, so the little drifter always comes up a bit short Still for what it is I think it's running good. After I kill it when it's hot, I hear the tank vent singing trying to suck more air into the gas tank than it can or maybe it's pushing out I'm not sure--I guess when it's venting it's pushing air out? (like an angry wife) Anyways does your guys tank vent make a singing noise? Elsewise I think my desmog went OK, the bike didn't quit or anything and it seems to be running pretty good like I said...
Posted by gdrudd13
- September 17, 2015, 07:51:13 AMIn my quest to figure out what to remove I capped a line that should have been open, and the bike didn't run at all, so it'll be obvious.
Posted by Tfrank59
- September 16, 2015, 17:19:02 PMRight, I'm not expecting any change – at least not for the better – but if I screwed up something it'll be a change for the worse
Posted by gdrudd13
- September 16, 2015, 07:55:29 AMIf it's like mine, I doubt you'll notice a difference from it other than your bike just got about 5 lbs lighter from getting rid of all that crap.
Posted by Tfrank59
- September 16, 2015, 07:39:30 AMOK, I did the desmog per your diagram and instructions. Exhaust is off the bike being worked on, so I can't try it yet but it won't be long. I'll let you know how it runs, thanks again.
Posted by Tfrank59
- September 15, 2015, 08:25:13 AMExcellent – thank you, I'll let you know how it goes. Haven't been under my tank yet, but if I can't see a color band on the hoses I might be back.
Posted by gdrudd13
- September 15, 2015, 08:20:16 AMYellow hose at carb-This should be left open to vent
Green hose at intake-This can be capped
Blue hose at right hand of tank-This needs to stay, this is the tank vent.
Red hose on left hand side of tank-This can be capped
vacuum line- This can also be capped
This is exactly what I am running on my bike right now. All the hoses should have some sort of colored band if not, there is a diagram that I'll copy. The blue line that is being discussed is the tank vent. Run it to a place on your bike that is out of the way and you'll be fine. As for the hoses that are capped, I just used the silicon hose caps. you can buy a bunch off of Amazon for cheap. Hope this answers your question.