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Post by wamgaming on Nov 26, 2017 19:00:14 GMT -5
I have been recently having problems with gas spilling out the cap in my 2016 TaoTao 49cc moped. Gas will spill out around the neck of the tank. The areas around my house are very bumpy and I think that has something to do with it. I was so irritated by it, that I bought a brand new tank and gas cap, however, the issue is still there. The problem seems to be alot worse right after I fill up the gas tank. I did notice that there seems to be a tiny hole on the neck, near the top, possibly for venting, but I thought that was strange because a full gas tank seems like it would be very easy to leak from this hole. I think that it might be where the leak is occurring. When i take off the gas cap, the gasket on the new gas cap is soaked, and the entire neck of the gas tank is drenched in gas. The new gas cap I bought is vented, and the previous gas cap that was on it was a lockable. I'm not sure if that one was vented or not. I am open to trying anything at this point. Any help would be greatly appreciated. Thanks!
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Post by cagiva4ever on Nov 26, 2017 19:20:09 GMT -5
Air ventilation should only EXIST on Cap alone. not in the neck of the tank itself.
are you sure that you dont have 2 Faulty tanks ? can you photo the "hole" at the neck area ?
all CAP's are vented.... no matter Key or key-less versions on 139qmb qma....
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Post by tortoise2 on Nov 26, 2017 19:22:33 GMT -5
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Post by wamgaming on Nov 26, 2017 19:32:09 GMT -5
Air ventilation should only EXIST on Cap alone. not in the neck of the tank itself. are you sure that you dont have 2 Faulty tanks ? can you photo the "hole" at the neck area ? all CAP's are vented.... no matter Key or key-less versions on 139qmb qma.... Yeah I can get a picture tomorrow. But the hole looks like it was meant to be there. It is a perfect circle, and my previous tank (exact same model); had an identical hole in the same place. I have some gas tank sealant, and think maybe I should just put some of that over the hole, because my gas cap is vented anyways, so it wouldnt need to have a vent hole there. |
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Post by wamgaming on Nov 26, 2017 19:33:16 GMT -5
It is the 2016 TaoTao ATM50A1 |
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Post by wamgaming on Nov 26, 2017 19:41:59 GMT -5
This is the gas cap. I think that the gas might be coming out of the vent hole on top of it.  This is the hole in the gas tank, that I was mentioning. It is on this tank and my previous tank.  
The moped is currently on a slope, that is why the gas level is as full. But it could be that I am simply filling it too full, however I dont think that it should leak depending on how full the tank is (just my opinion) |
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Post by jackrides on Nov 26, 2017 21:42:27 GMT -5
The situation is not right. But for now, don'fill it so full.
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Post by cagiva4ever on Nov 27, 2017 5:36:38 GMT -5
that Hole certainly looks like factory made and NO mistake hole...
3 things come to my mind in Priority order:
-some 139QMB apparently suffer from poor CAP ventilation.. i have Danish dealer netweork papers for Peugeot v-clic that has apparently insufficient/faulty o-ring inside CAP (photos etc on the document).
Comes to my mind that your Tank hole (looks to be drilled not punched) could be China mans diy factory Fix for same issue. That kinda Fix doesnt meet CoC etc approval laws no way never ever....or National motorvehicle Approval safety laws.
-2nd possibility BUT HIGHLY UNLIKELY ,is for a "missing outlet pipe" that hasnt been welded over the drilled hole Externally. Via this tiny hole "Petrol station over filling" would poor out (But hole should be much bigger for such purpose..)
Anyway at least "10 wheel 139QMB's have the rubber matt "bowl" under tank neck with outlet hose into "ground" for this said over filling/spill purpose...
3rd option is pure Factory accident using some pre-production NOS Tanks or Tanks from some other Vehicle model that arent Finished.
Most locigal answer would be the 1st above "China mans poor Fix".
anyway, generally speaking, what ever GasTank what ever machine, you never ever should fill Over above neck bottom. no matter lawnmover or scooter or motorcycle etc.
Best fix would be to drill and Thread Tap the hole, so that you can fit like M4 or M5 size bolt into it. so that you can use washer and Proper gasket sealant under the small washer. summink like "Honda Bond" petrol solvent resistant sealant.
unless you take your Spare tank empty alone to welder. or either1.
as is, the Scooter is a Fire Hazard......This kinda tank hole could lead into mass lawsuit in states. id deffo report into transport and safety agency. and get a fixed Warranty Tank under Law, it should not matter if you have Warranty left, as such issue is "Factory recall" or "importer Recall" issue once Agency buts Bann for the vehicle usage...
generally speaking about GastTank designs... does (yours) the tank Neck bottom surface/line go below GasTank top surface ? it should go under tank top surface/line like 1~3centimeters, as a Functional reason to Act as a "Anti Spill" for waves...so that moving sloshing petrol cant reach Tank neck too high up....
if the design in faulty, FULL tank of Petrol will always spill Slash over the bottom surface of Tank CAP, and piss out in some amount.
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Post by 90GTVert on Nov 27, 2017 6:23:54 GMT -5
If that's a flaw, most of my Chinese scoots are flawed. Even when the cap is vented, they seem to have it. I even welded up that hole on a tank that I modified (new, never had gas in it before). It had a vented cap anyway and still worked fine, but if I overfill it, it will just come out of the vent or seal for the cap now. Easy solution is to not overfill it. I still continue to overfill mine regularly though.
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Post by wamgaming on Nov 27, 2017 11:25:50 GMT -5
If that's a flaw, most of my Chinese scoots are flawed. Even when the cap is vented, they seem to have it. I even welded up that hole on a tank that I modified (new, never had gas in it before). It had a vented cap anyway and still worked fine, but if I overfill it, it will just come out of the vent or seal for the cap now. Easy solution is to not overfill it. I still continue to overfill mine regularly though. What would be considered overfilled? I have heard that it is under the gas nozel stopper. The metal bracket inside the tank? If that is the case. It would barely register full. I just feel like you hsould be able to use all the space in the gas tank, being that it is so small. |
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Post by 90GTVert on Nov 27, 2017 12:54:51 GMT -5
I think you have the right idea on full. I also like to fill it all the way to the top, and I've just learned to expect that it spills if I do that. I guess it's never annoyed me enough to really investigate it beyond there.
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Post by wamgaming on Nov 27, 2017 19:15:38 GMT -5
I think you have the right idea on full. I also like to fill it all the way to the top, and I've just learned to expect that it spills if I do that. I guess it's never annoyed me enough to really investigate it beyond there. Yeah. Mine seems to be a substancial leak. Im more annoyed that I end up smelling like gas after I drive it anywhere. I wouldnt mind it if it was a slower leak. I drained some of the gas out this morning and that seemed to help, but id like to fix the root of the problem. im thinking about possibly buying a cap with a vent on the top of the cap. Then simply patching the hole on the side of the tank. My only worry is that recently I think the vent itself is leaking gas from the cap. That would explain why more feul leaks more. Im open for ideas, just really would like to get it fixed, so i dont smell like a gas station after riding it. |
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