Canister Troubleshooting - BMW Luxury Touring Community
 
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post #1 of 5 Old Aug 3rd, 2007, 1:32 pm Thread Starter
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Question Canister Troubleshooting

Starting to have the sticky fuel gage problem on my '05KLT. Has been no trouble up until my last fill-up. Filled up with fuel and gage didn't react. Took nearly 30 minutes for it to indicate a full tank. It seems to be falling normally, but I'm only halfway through the tank currently. Reading the archives I gather I'm looking at a damaged gage tube caused by one of two primary events. Either the fuel nozzle has contacted the gage and damaged it, or the vent line is clogged causing the tank to collapse and damage the gage. I don't recall any "whoosh" noise when I removed the cap but my helmet was on and the station was noisy.
Finally the question. While I'm changing the oil tonight I want to trouble shoot the vent line and canister. If I remove the hose from the canister and apply a vacuum to the hose and then to the canister what would I expect to find if the canister is the problem? Will there be fuel in the line? Should air pull freely from both sources and not build up any vacuum (I'll loosen the gas cap)? Does the canister clog completely when it goes bad? How else can the system be evaluated?
I want to do as much as I can tonight without removing tupperware and I would like to isolate the failure or damage rather than simply remove the canister.
Thank you,

Dan
2005 K1200LT - Ocean Blue

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post #2 of 5 Old Aug 3rd, 2007, 5:14 pm
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I have not had this happen to me but I have had the tank off and to collapse that tank it would need to have the vent clogged completely..

IMHO, You won't or can't use gas fast enough so that even a very small air vent should not keep up with the need for air...

Go to a quiet place after riding a few miles and see if you can hear some sort of air 'rush' when you open the tank.

Jack D. (Southern Connecticut)
2001 Black LTC
2015 Blue R1200GSA
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post #3 of 5 Old Aug 3rd, 2007, 5:19 pm
 
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My gage does that sometimes & my canister is long gone.
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post #4 of 5 Old Aug 3rd, 2007, 9:02 pm
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On a trip to the Chicken Rally in Huntsville, AL this past May, I had a tank collapse because of a pinched vent line to the canister. About a month after that was repaired, the gas guage started acting up again. On getting back home after one such episode after riding in the rain, I blew air thru the vent hose under the seat toward the canister, and water came out the canister. I removed the canister, and put it in the sun to try to dry it out. After sitting in the sun for most of the day, I again blew air in it and still had moisture coming out. I reassembled the bike without the canister, and have not had any more fuel gauge problems.

Tommy
02 K12 LT - 251,000 Miles and counting
442,000+ BMW Miles and counting
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post #5 of 5 Old Aug 3rd, 2007, 10:26 pm
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I have had only one fill up that was slow to register in 30K miles and that happened a few weeks ago and has not done it again. No venting problems and no explanation.

John
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