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Thread: Gas Smell on 1100r

  1. #1
    Bryan
    Join Date
    Jun 2007
    Location
    Bryan, Texas
    Posts
    132

    Gas Smell on 1100r

    I was wondering if there were any "techy" people out there who might could speculate on a problem on my 1100r. Once I have reached RPM's of about 4-5 on my bike, you can smell gasoline pretty bad. No sign of leakage though. Doesn't seem to have any acceleration problems though. Also, my last tank of gas was only 33 mpg. Any ideas of what might be the problem? Sure seems to be running "rich"

    Thanks for the help!!

  2. #2
    That bike - OEM - has a charcoal cannister to collect tank vented fumes and to release the fumes back into the combustion stream through the throttle bodies. So, if OEM, you should not smell fumes. If the cannister has been removed or bypassed then the tank is vented to atmosphere and you might smell fumes standing in the sun. I would not expect to smell anything going down the road.

    If by rpm 4-5 you mean riding at that rpm it is one thing. If you mean parked and reving the engine it could be something else.

    If you mean riding at 4-5K rpm the smell shows up you either have a very rich running motor or a liquid fuel leak. I would do a chop test! That is, in advance pick a convenient spot where you can pull of the highway by coasting in. A roadside park or picnic area works, so do some convenience store lots. Approach at 4K to 5K and kill the engine - then coast to park. Let it cool so you don't burn yourself for 10 or 15 minutes and then pull and examine the spark plugs. They should be dry, and light tan. If wet you have a big problem. If sooty it is way too rich.

    If it is running rich you need to make sure the TPS is set right, and ought to get any ECU fault codes checked. You could have a bad temperature sensor or some other fault.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  3. #3
    bmwbil
    Guest
    Quote Originally Posted by PGlaves View Post
    That bike - OEM - has a charcoal cannister to collect tank vented fumes and to release the fumes back into the combustion stream through the throttle bodies. So, if OEM, you should not smell fumes. If the cannister has been removed or bypassed then the tank is vented to atmosphere and you might smell fumes standing in the sun. I would not expect to smell anything going down the road.

    If by rpm 4-5 you mean riding at that rpm it is one thing. If you mean parked and reving the engine it could be something else.

    If you mean riding at 4-5K rpm the smell shows up you either have a very rich running motor or a liquid fuel leak. I would do a chop test! That is, in advance pick a convenient spot where you can pull of the highway by coasting in. A roadside park or picnic area works, so do some convenience store lots. Approach at 4K to 5K and kill the engine - then coast to park. Let it cool so you don't burn yourself for 10 or 15 minutes and then pull and examine the spark plugs. They should be dry, and light tan. If wet you have a big problem. If sooty it is way too rich.

    If it is running rich you need to make sure the TPS is set right, and ought to get any ECU fault codes checked. You could have a bad temperature sensor or some other fault.
    Your a God..........

  4. #4
    Oldsalt
    Guest
    Quote Originally Posted by scotchale View Post
    I was wondering if there were any "techy" people out there who might could speculate on a problem on my 1100r. Once I have reached RPM's of about 4-5 on my bike, you can smell gasoline pretty bad. No sign of leakage though. Doesn't seem to have any acceleration problems though. Also, my last tank of gas was only 33 mpg. Any ideas of what might be the problem? Sure seems to be running "rich"

    Thanks for the help!!
    On my R11RT-P if I fail to mash hard enough on the gas cap after a fill-up I get gas smell as I get up to speed - with the seal not made, the fumes waft up in the air bubble behind the fairing and into my sizeable snout.

  5. #5
    TNSTAAFL Troutluck's Avatar
    Join Date
    May 2006
    Location
    West Fork, Arkansas
    Posts
    248
    My 'R smelled like gas, too, until finally one day a fuel line popped off and dumped gas all over the side of the bike. I'd check the hose clamps real careful like.
    Jack Pate | '09G650GS | '95 R100RT | Previously: '00R1100R, '87K75T
    NW Arkansawyer |
    BMWMOA #125430 | Fraternal Order of the Mudshark (FOM #0001)

  6. #6
    Bryan
    Join Date
    Jun 2007
    Location
    Bryan, Texas
    Posts
    132

    No Canister

    Thanks for the current input regarding the fume/fuel issue with the 95 R. My wife posted this recently (as scotchale!), but I've only now been online to look over it.

    The Charcoal canister was removed by the previous owner. I'll be backtracking the fuel lines as well. Local club member had similer problems with a fuel line connector rotting away.

    I hope to see "dry" plugs, but it probably won't surprise me to see them wet. I'll do a test run on Sunday probably. Weather hasn't been too cooperative lately and I haven't been in town either.

    The throttle is closing well when released, ie-based on a seminar at Wisconsin conducted by Glaves, the injectors are shutting off when throttle released. Unlike my RT with many miles on it now...I can tell the injectors are not fully shutting off when releasing throttle/decelerating on the RT, but that's a separate issue/bike.

    My current assumption is that something is causing the computer to keep the injectors open longer, thus running richer than it should.

    I'll keep an eye on this topic for other input and have some answer on Monday after the weekend.

    Scotchale

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