K11 Owners Group

[Pannier Down]

Hi all,
I seem to be on top of most of the issues my current K came with, but this one is getting difficult to solve. I have run several searches of previous posts but can't find anything quite the same.

When I turn the ignition on, the fuel pump whirs, but sometimes it just keeps going, whereas I believe it should whir then stop until I start the engine. This coincides with a problem whilst riding. If the pump does not cut after a few seconds, then as I pull away in first gear, the engine dies. I then re-start and away we go as usual.

I have cleaned the four pin plug at the rear of the tank and the motronic connector. The TPS is set and the TB's balanced, and initially I thought I had cured it, but after a run yesterday it started again. It does it from cold or when hot, always first gear when moving off from a standstill. Before taking it apart today I turned the ignition on and the pump whirred then stopped as it should. I moved the bike a little and noticed it started whirring again, then stopping, and if I shake the bike, I can cause it to buzz on and off.

So, the questions are, could this be the fuel pump, sender, or regulator and how would I check?

Thanks in anticipation.

Mike
_________________
Sold K100RT and bought Triumph,
Sold Triumph to buy 95 Graphite K1100LT
Sold K1100LT and bought Varadero,
Sold Varadero and bought 99 White K1100LT
Sold K1100LT and bought ZZR1100,
Sold ZZR and bought 93 Red K1100LT.
When will I learn???

[gpzoduibh]

I am sure someone more savvy will chip in but I know from working on car ECU's it is usually the series of pulses from the crank sensor that tells the ECU to keep the petrol pump powered up ( ie because the engine is running) if your connection from the hall effect sensor which the K's have was a bit intermittent it may give you your problem , i would work back from the connector to it which is with the injector loom ? i think ? through the wiring back to the motronic ECU looking for bad joints ....
Good luck
Bill
_________________
1995 Grinnall Scorpion III(1990 K100 16v motor)
2010 KTM 450 EXC
Moto Guzzi V50 powered hovercraft !
1989 K100RS (8V) special edition
1974 Yamaha DT360
1972 Sanglas 400 T
1980 Yamaha XS110-Watsonian Palma sidecar
1966 Bridgestone 175 dualtwin
1980 BMW R100RS
1979 Bultaco sherpa T 350
1979 Yamaha DT175MX
1990 Honda XR250R

[Inge K.]

[Pannier Down]

Thanks guys, I will have a look today. As with anything of this nature, I need to have a methodical approach, its a bit frustrating though as other than this, the bike is running great.

Mike
_________________
Sold K100RT and bought Triumph,
Sold Triumph to buy 95 Graphite K1100LT
Sold K1100LT and bought Varadero,
Sold Varadero and bought 99 White K1100LT
Sold K1100LT and bought ZZR1100,
Sold ZZR and bought 93 Red K1100LT.
When will I learn???

[Flying Duck]

Dirty ignition switch? (Just a guess.)
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

[Matthew Porter]

Any chance it might be down to the side stand cut-out switch being faulty?
_________________
Matthew
BMW K1100LT x 2 (1996 & 1997)
Eric Clapton said he wanted to quit guitar when he heard Jimi Hendrix play. I feel kinda that way when I see a genius riding a motorcycle. But then I kick myself and try and do better.

[Pannier Down]

Been hunting gremlins, checking wiring and switches and cleaning connectors.

Well I found two separate problems, and it now seems fine, although I am not sure if these things would have caused the symptoms I had or not.

First, the rubber gasket under the filler cap was fitted back to front, so the breather was blocked by it.

Secondly, the fuel pump was not fully seated in its bracket, therefore it would move around a bit as the bike moved.

Of course, in removing the tank I have removed and refitted the four pin plug that has caused other people no end of problems..............

So, fixed for now, I need to run it for a while to prove that it is so. Thanks for all of the advice so far, and fingers crossed.

Mike
_________________
Sold K100RT and bought Triumph,
Sold Triumph to buy 95 Graphite K1100LT
Sold K1100LT and bought Varadero,
Sold Varadero and bought 99 White K1100LT
Sold K1100LT and bought ZZR1100,
Sold ZZR and bought 93 Red K1100LT.
When will I learn???

[Pannier Down]

Good news and bad, first the bad. So it was not fixed at all. I even cleaned it before a test ride, but it still decided to play up.

Now the good, I have found the problem. I went back to the tank and followed the wiring from the four pin, all seemed O.K. I did the same for the plug for the HES, which seemed O.K. and no amount of prodding it would cause the problem. Then I followed the wiring from the kill switch to the large connector under the tank and bingo. The slightest prod of this caused the pump to start and stop. With the tank in place, I could replicate what was happening. As you pull away,the fuel moves and the tank shifts slightly and pushes against the large connector, causing the wires to pull from either end. When I checked the plug it was loose. I have cleaned it fully, added a little grease and refitted, I put a little electrical tape around the outside to ensure it is held in firmly.

All seems well, and this time I am confident that I have it sussed.

Thanks again to those who offered advice.
Mike
_________________
Sold K100RT and bought Triumph,
Sold Triumph to buy 95 Graphite K1100LT
Sold K1100LT and bought Varadero,
Sold Varadero and bought 99 White K1100LT
Sold K1100LT and bought ZZR1100,
Sold ZZR and bought 93 Red K1100LT.
When will I learn???