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Thread: 95 1100 LT just quit while going down the road

  1. #1
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    95 1100 LT just quit while going down the road

    1995 K 1100Lt with less than 30,000 on the clock quit while I pulled up to a traffic light. I've tracked it down to fuel pump not running but the fuel pump is fine. Checked the wiring from the sending unit connector to the fuel pump and its good. Checked the kick stand switch and its harness and it is good. I've played musical relays with no luck either. do I need to start shopping around for a Motronic ECU so I can get out and enjoy ridding or am I missing something obvious. Its pretty much an unmolested and clean bike but it has sat most of its life.

  2. #2
    Benchwrenching PGlaves's Avatar
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    I suspect the Hall Effect Sensor (HES) has failed.

    Do you have spark?

    Does the fuel pump come on once when the key is turned on?
    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
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  3. #3
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    It has spark

    Paul

    The fuel pump does not run at all. Before I pulled the tank off and released the fuel pressure it would fire but quit like it was out of gas. I've checked and I get no voltage at the fuel pump and I just checked the feed to the fuel pump off the bottom of the fuel pump relay and I get no voltage when the key is turned on. The power lead to that relay has 13+ volts.

  4. #4
    NC Piedmont Rider ncstephen's Avatar
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    fuse?
    03 K 1200RS (Black is Best)
    03 Honda RC51
    74 Honda CB750 K4

  5. #5
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    First place I looked

    #6 I believe, musical fuses and relays was part of my roadside fun. I get 13 + volts to the supply side of the fuel pump relay and that's where it ends.

  6. #6
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    Wait ... no voltage on the power side (or whatever you call it; not the coil side) of the fuel pump relay? Shouldn't that go straight to battery? (Through a fuse, I suppose.) That would be a bad relay, or wiring fault, no?

    If you're certain there's no power happening there, then that's it. Otherwise, I'd say have a look at the connector between the tank sending unit and bike wiring harness.

  7. #7
    3 Red Bricks
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    This may or may not apply;

    On 2valve Ks, the fuel pump does not come on with the key. You must push the starter button to get power to the pump. This will only last for a couple of seconds unless it senses that the engine has started (signal from the Hall Effect sensor).

    I do not remember if 4valve (late K100RSs and K1100s) operate the same way.



    LONG MAY YOUR BRICK FLY!

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  8. #8
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    Its not the same as a 2 valve

    The four valve (my LT) is different than the two valve. When you turn the key on with the side stand up, in neutral and the idiot switch(right side kill switch)set to run the fuel pump should cycle for 1-2 seconds. It starts back up after the motor is cranked over to start the bike.

    James in Ca. I have a pretty good working knowledge of relays and how they operate, unfortunately I don't know the proper terminology and I have a rather significant color vision defect so its a challenge for me to give a precise description other than to say the power supply to the fuel pump and Motronic relay is 13+volts, the switching circuit for the relay is not getting any switching voltage so the relay is not operating as it should.

    The wiring harness from the relay to the fuel pump has been checked with an ohm meter and it is good, I have it out of the bike and in my hands and have manipulated the harness both before and after the sending unit so I don't think its the wiring.

    I am going to dig in a little and check some ground straps and a couple other things.

    Can anyone out there tell me if the FI ECU has anything to do with the initial 1-2 second fuel pump run up when the key is switched on. I would like to eliminate or isolate this as the problem so I can either look for one or not worry about it

  9. #9
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    Similar to the K 75S only different

    Update on my ongoing adventure with the K 1100LT. I purchased and installed a new Hell Effect Sensor, properly I might add and nothing has changed. Good spark but no fuel pump or power from the F/P relay to the pump. I'm getting a little deep into this very clean low mileage K bike but at some point it might be parts for sale. Any more ideas???

  10. #10
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    Similar problem in the past

    Sounds like the same problem I had in the past. Can't remember if it was a K1100 or a K100 but I removed the right battery cover and toward the bottom of the tank the fuel pump plugs into the wiring harness. Although it was still plugged together it lost connection. Simple plug replacement and problem solved. Good Luck!
    93 K1100LT

  11. #11
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    I checked continuity

    I have been busy with the ohm meter checking this and checking that. I will double Oh wait quadruple check the wiring between the F/P relay and the in tank F/P connection just to make sure I have had enough frustration with this fine but silent machine.

    I hope I have missed something very obvious and can send all my helpers a six of their favorite beverage out of sheer embarrassment!!!

  12. #12
    NC Piedmont Rider ncstephen's Avatar
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    Perhaps read through here for additional thoughts.

    http://www.k11og.org/forum/viewtopic.php?t=8412
    03 K 1200RS (Black is Best)
    03 Honda RC51
    74 Honda CB750 K4

  13. #13
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    "Veerdy Interesting"

    First thing I will do is clear the bench, then I will recheck the wiring harness and fuel tank sender. I will try getting in and cleaning(my God its tight)the Motronic connections and last but not least put the finishing touches on my "parting out a 1995 K 1100LT" 100% complete with some nice new parts and was running great until a Gremlin took over and won the game.

    Great info and I will make it a point to try everything mentioned in the post.

  14. #14
    NC Piedmont Rider ncstephen's Avatar
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    Also go over to advriider.com and make contact with user named duck. He has a habit of picking up complete or semi complete K bikes others have given up on and getting them ridable. He might just have a few clever ideas. Overall I am willing to bet a quarter that this is actually something simple. The challenge is finding it without muddying the waters with other issues.

    NCS
    03 K 1200RS (Black is Best)
    03 Honda RC51
    74 Honda CB750 K4

  15. #15
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    The Gremlin took a short break today

    I know there is a smiling Gremlin somewhere nearby. I cleaned connections along with the tiny tiny Motronic terminals and started testing from scratch.

    I removed and relocated the F/P, sender and related harness to my not so cleared work bench.

    I got a spare 12 volt battery, volt ohm meter, some extra jumper wires and a good dose of relax and take my time.

    I jumped right in and tried the old power up the fuel pump through the harness and sender trick resulted in the fuel pump coming to life with a sweet little buzz. Interesting! I wiggled wires, bent and folded them up and the fuel pump would still go strong at each attempt.

    So I moved to the bike.

    I checked continuity and function of the side stand switch at the right side connector, it checked out good.

    I double checked to make sure all my relays were in place and the Motronic F/I plug was snug, just for laughs I bridged the side stand connector(for the 3rd time) and I checked for any voltage readings (key off) at fuel pump power supply pin socket on the frame wiring harness, found nothing. I switched the key on and got a 2 second 13 volt reading, hit the starter button, the motor cranked and the I got a constant 13 volt reading at the pin socket. PROGRESS!!! Something worked but I just don't know what because all the previous checks showed no voltage at that pin socket and no voltage reading coming from the F/P relay.

    I plugged the fuel sender connector into the main harness with the fuel pump still attached and turned the key. Nothing! I ran seperate ground wire to the body of the the sending unit and tried the key again. Fuel pump ran for 2 seconds, shut off and then restarted when I cranked the bike over. Progress again!

    I removed my side stand switch bridge wire and reconnected the switch to the system. I tried the key and the the fuel pump ran 2 seconds and shut off, cranked the bike and the pump ran as it should.

    WOW, I fixed it but I don't know how!

    I left everything as it was, shut the light off in the garage and came in for lunch. I returned to the bike after lunch just to check again to make sure it wasn't a dream. The Gremlin had returned! All I did was turn the garage lights on and walk over and turn the key on and got no fuel pump action. Bridged the side stand switch again and still no fuel pump. So I went to work.

    Its getting closer to being a parts bike than it could ever imagine!

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