Engine trouble after fill up - BMW R1200GS Forum : R1200 GS Forums
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post #1 of 16 (permalink) Old 02-Mar-2019, 01:41 AM (320) Thread Starter
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Engine trouble after fill up

Hello,
I finally purchased my dream bike, a 2009 R1200GS, So Iím pretty new to here.
My trouble is that all 5 times that Iíve filled up my tank to full the engine hesitates, idles low or rough and remains the same until I arrive home. I would need to rev up the throttle at red lights to keep it from stallling. When I get home thereís a slight smell (I could swear it smells like gun powder or something burning).
The bike rides perfect before and the day after all of this, so it really has me stumped. Maybe it idles low for a second the day after but it finds its place right away.
Any thoughts?
Thanks!
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post #2 of 16 (permalink) Old 02-Mar-2019, 10:19 AM (680)
LAS
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Sounds like a vacuum problem. Gas tanks have to breathe. Most likely your gas tank has a clogged vent or the charcoal canister is flooded with gas. These are both easy to check and to remedy. One easy way to see if this is your problem is to leave the gas cap open after a fill up to see if the problem reoccurs.
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post #3 of 16 (permalink) Old 02-Mar-2019, 10:39 AM (694)
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I would pull the gas tank and inspect all fittings and blow out all hoses. The purge (or tank vent) valve is probably sticking open so inspect that.
https://advrider.com/f/threads/wtf-i...-valve.732481/

Rick
2018 R1200GS

Last edited by Rick92040; 02-Mar-2019 at 12:42 PM (779).
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post #4 of 16 (permalink) Old 02-Mar-2019, 12:45 PM (781)
LAS
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Quote:
Originally Posted by Rick92040 View Post
I would pull the gas tank and inspect all fittings and blow out all hoses. The purge (or tank vent) valve is probably sticking open so inspect that.
If the easy stuff fails, pulling the tank would be on my list of things to look at, but it would not be my first move or even my first move if the easy stuff didnít yield favorable results.
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post #5 of 16 (permalink) Old 02-Mar-2019, 01:11 PM (799)
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Perhaps pulling the tank is a bit drastic. I just wanted to make sure he cleans all the hoses.
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Rick
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post #6 of 16 (permalink) Old 02-Mar-2019, 06:35 PM (024)
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The clogged vent hose or flooded charcoal canister diagnosis fits the symptoms better than problems under the tank. My money is on the canister being flooded. Easy to remove permanently.
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post #7 of 16 (permalink) Old 04-Mar-2019, 04:41 PM (945)
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Are you over-filling? ...... flooded canister?

Past: 1955 Norton ES-2, 1972 Norton 750 Commando Long Range Fastback, 1977 Honda 350XLE, 2001 R1150RT (written off), 2005 R1150RT, 2004 R1150GS, 2001 F650GS.
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post #8 of 16 (permalink) Old 07-Mar-2019, 01:40 AM (319)
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Engine hesitation ideas

Quote:
Originally Posted by Heyrick69 View Post
Hello,
I finally purchased my dream bike, a 2009 R1200GS, So Iím pretty new to here.
My trouble is that all 5 times that Iíve filled up my tank to full the engine hesitates, idles low or rough and remains the same until I arrive home. I would need to rev up the throttle at red lights to keep it from stallling. When I get home thereís a slight smell (I could swear it smells like gun powder or something burning).
The bike rides perfect before and the day after all of this, so it really has me stumped. Maybe it idles low for a second the day after but it finds its place right away.
Any thoughts?
Thanks!
Just an idea, does it only do it when the tank is full- really full. If you over fill a tank ( or normal filling and let it sit with a hot motor or on hot day ), the excess fuel goes into the vapor recovery canister and into your engine making it very rich for a while. Vapor recovery systems usually handle vapor, but now it handling liquid and it runs into the engine. This happen pretty regularly on my Harley. If I fill it to the top and then immediately stop for lunch. The gas expands from the heat of the engine and up into the vent tube and into the vapor canister. Then after lunch I would start the bike and it would stall in the middle of the intersection. If I don't over fill the tank and/or fill up after a long road break, it never happens. Just a suggestion.
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post #9 of 16 (permalink) Old 07-Mar-2019, 08:47 AM (615)
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I hope the guy comes back and lets us know if he fixed it or not.

Rick
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post #10 of 16 (permalink) Old 07-Mar-2019, 10:09 AM (673)
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Quote:
Originally Posted by Rick92040 View Post
I hope the guy comes back and lets us know if he fixed it or not.
Does anybody ever do that?

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