K11 Owners Group

[K1100 Rocketship]

A friend has a 1985 K100. It will not run. He has traced the problem to fuel pump. There is only 1.5 volts at the fuel pump. He is unable to identify which is the fuel pump relay. Where is it & how do you identify it please ? Has anyone any ideas which may assist ? All contributions greatly appreciated !!!!
Thanks.
Chris
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Chris Dean
Devizes Wilts UK
1995 k1100RS So. Where is 6 th Gear ???

1973 T140V Bonneville sold
1971 TR25 Trailblazer sold
Now own 2001 Triumph Sprint ST 955 but still miss K1100 !!

[Flying Duck]

Go here: http://www.ibmwr.org/ktech/relay-box.shtml
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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

[K1100 Rocketship]

Thanks for that Flying Duck.
What we really want to know is, will it be the pump relay failure which is resulting in 1.5 v at the pump, or could it be something else & if so, what ?
Is there a test that can be done on the pump relay, to eliminate it ?
Any assistance/guidance, greatly appreciated.
_________________
Chris Dean
Devizes Wilts UK
1995 k1100RS So. Where is 6 th Gear ???

1973 T140V Bonneville sold
1971 TR25 Trailblazer sold
Now own 2001 Triumph Sprint ST 955 but still miss K1100 !!

[Rafal]

[Flying Duck]

If you're getting that low of a voltage I wouldn't think it's a relay as usually a relay works or it doesn't.

There's two places in the circuit that can fail:

1) Fuel tank connector. If that's the problem you can just rewire.

2) Connections as the base of the fuel level sender. The solution is to replace the fuel level sender.
_________________
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

[K1100 Rocketship]

Hi Duck,
Thanks again. Will pass on to my friend. So far hes got volts @ pump up to 10.5 which should be enough to run it but all that happens is a click. Suspect pump siezed ? I suspect, as u say, bad connection & corrosion.
I may be back
_________________
Chris Dean
Devizes Wilts UK
1995 k1100RS So. Where is 6 th Gear ???

1973 T140V Bonneville sold
1971 TR25 Trailblazer sold
Now own 2001 Triumph Sprint ST 955 but still miss K1100 !!

[Flying Duck]

If it just clicks then DON'T burn the pump out by applying voltage for any period of time.

Soak it in Chevron Techron Concentrate for a few days. I let a stuck one like that soak for a week. It was still stubborn after that but after about 15 seconds of 12.4V it unjammed and started working again.

I tried soaking it in PB Blaster before that but that didn't work.
_________________
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

[RJTrucker]

I belive he said it was a 1985. If it is a 1985 then the connector is located on the front left side under the tank. At leas tthis is where it is on the early 1985s that I have.
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Ron
1993 K11LT
1985 K100RS with over 100K on it
1985 K100RS Luftmiester Turbo Work in progress (any help is appreciated)
1974 R90/6

[Tim (Midland Section)]

There is another possible cause. A Scots member of the UK BMW club had this last year. Eventually traced to a crap installation of an immobiliser. Buzz out the continuity of the wire from pump relay to connector or use a 12V 21Watt lamp instead of a meter to make sure the feed is good enough to power the pump motor.
HTH
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Regards Tim,

Grey haired riders don't get that way by pure luck
1996 Guzzi Cali3 LAPD
1972 750 Commando
G6HRN
#485

[hfxrzw]

You could refers the polarity on the pump and see if it is willing to start up in the other direction. If it does that than refers the connection again and try.
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Cheers, Rene

Greetings from Florida.

BMW K100 '85