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Discussion Starter #1
I just experienced something for the first time on my ATAS that if I had not had experience with similar symptoms I might be a bit more worried than I am, but at present I am just annoyed. I was just running down the freeway at about 70 mph and went to pass and had a bit of a power lag (on tour setting). Then a bit later when on a secondary road it was starving for power and surging like it was not getting an adequate fuel supply. I pulled over and switched to User mode (set at 1,1,1) and took off. Still the problem, and it was RPM not speed related, like it had a governor. I pulled over again and opened and closed the gas cap, and it began running perfectly again. Has anyone experienced a blockage of the fuel tank venting system, and if so, where is the first place I should look? Thank for the help.
 

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Did it feel like flat spots and surges when giving it the beans? I've had that and am curious as well because I've never felt it on a bike before.

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Discussion Starter #3
Tequila: Yes, very much so, and I am fairly confident that it is the fuel tank venting due to how I (temporarily?) resolved it. Makes me a bit nervous with a 5,000 mile trip scheduled in 3 weeks.
 

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Discussion Starter #4
I typed the above at my office. I left to head home about 15 miles, and I am fortunate that the Honda shop was on that path and about 5 miles before I got home. It died at least a dozen times, all while i was in traffic. I did get it there and said, "it is still in warranty, fix it, and got a lift home. I will post what is found.
 

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I have the ATAS. It surges in traffic but is OK at speed. However whenever the bike is parked in the garage the bike sings to me. The tank vents all the time with a high pitched whine. When I release the filler there is a rush of air. Not sure if its air flow in or out but the tank is at a different pressure to external pressure. That implies that the tank venting arrangement is restricted ?
The tank noise is loudest when the bike is hot and the heat is rising up and warming the tank after a ride
 

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I have the ATAS. It surges in traffic but is OK at speed. However whenever the bike is parked in the garage the bike sings to me. The tank vents all the time with a high pitched whine. When I release the filler there is a rush of air. Not sure if its air flow in or out but the tank is at a different pressure to external pressure. That implies that the tank venting arrangement is restricted ?

The tank noise is loudest when the bike is hot and the heat is rising up and warming the tank after a ride
Mine does exactly this. Would love to know of the slight flat spots when winding it on at motorway speeds can be fixed or if it's a case of "they all do that sir"...
 

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It is most noticeable in first gear for me. It just feels like the bike doesn't get power unless it is in 2nd+. But it still seems to have a serious flat spot ~4.5k for me

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Just throwing in another tally to the 'me too' tab. Same symptoms, trying to accelerate and having flat spots, or the bike just refusing to accelerate at all until the throttle is let off and applied more slowly. There have been a couple threads on this both here and on ADV about similar symptoms as well. Some people had blockage on their fuel pump from bad fuel or the rustproff liner in the tank coming off, but most of the time the symptoms occurred during hot weather, so an issue with the venting could pretty likely as well. Might make sense as to why this seems to be mostly an ATAS problem as well, with the new redesigned tank.
 

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Discussion Starter #9
A bit of an update, still no Joy. Talked to the shop yesterday and they ruled out fuel, but they don't know what the problem is, and it seems that mother Honda hasn't a clue yet. It runs strong and then just dies like it was turned off, but if you hit the starter it immediately starts and runs strong until the next death.
 

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As Motorwerx said, a few of us have experienced similar problems. Mine however came down to bad fuel and after a good clean out and new fuel filter, all came good. It was similar however in that when you switched the motor off and back on, it would run again fine for a bit. You can read more on my original post (subject - Rev limit (and fuel light) issue on ATAS in a very far away place).
 

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Discussion Starter #12
Stopped at the shop yesterday, and the good thing is that it is not dying. The bad thing(s) are they have no clue as to why it stopped the behavior, and the engine gets up to 6,000 RPM and it just goes flat like it is starving for fuel. Having it to take on my scheduled trip in 2 weeks is becoming questionable, as I am not wild about it giving up the ghost a couple thousand miles from home.
 

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Discussion Starter #13
Just got an update. Mother Honda is telling the shop that with some L2 models the fuel pump is susceptible to "getting something in them" and it could cause these problems. Total plug, it dies, pressure is off the line, fuel flows starts right up. A partial obstruction could cause the current RPM limit at 6,000 acting as if it is starving for gas. All of those pieces might fit as the tech said that when it quite dying the only thing he had done was slightly move the fuel tank, so perhaps it dislodged whatever it was and went from a full block to a partial block. They are sending a new fuel pump assembly.
 

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I'm getting the same on my ATAS. Feels like fuel starvation when on the throttle. A power reset will return normal operation. It's very annoying.
 

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It's good that Honda are trying to sort this out, but equally unless there's a redesigned fuel pump that's less prone to this type of blockage, it could just as easily happen again surely.
 

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The biggest question I have is what is causing this issue which is now seemingly getting more and more widespread across multiple ATAS owners? Mine is bad fuel causing the issue which I've hopefully sorted with additional fuel filters, but others have found bits in their tanks. Regardless the fuel filter in the tank doesn't seem to cope and the fuel pump seems very sensitive causing this surging. VFMoore - did they give any indication on what exactly was 'dislodged'?!

I really hope Honda take notice and come up with a fix for both future and current owners.
 

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Discussion Starter #18
I hope they identify it when they replace the pump, and that is assuming they have hit on the right problem. To bad it is not as simple as my GL1800 where you run the tank below half, pull the seat, remove the pump and install new, then reinstall the seat. This bloody thing goes in the bottom. Of interest is that they are sending a pump from a 2019 as it is a different manufacturer.
 

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The biggest question I have is what is causing this issue which is now seemingly getting more and more widespread across multiple ATAS owners? Mine is bad fuel causing the issue which I've hopefully sorted with additional fuel filters, but others have found bits in their tanks. Regardless the fuel filter in the tank doesn't seem to cope and the fuel pump seems very sensitive causing this surging. VFMoore - did they give any indication on what exactly was 'dislodged'?! I really hope Honda take notice and come up with a fix for both future and current owners.
I believe I read over on ADV forum the ATAS tank liner was peeling off and plugging the fuel filter. Can't find the comment / thread despite searching.
 
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