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Need urgen help. Fuel pump problem

 
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K1100 Rocketship
Big Brick Rider


Joined: 25 Feb 2006
Posts: 54
Location: Devizes Wilts UK

PostPosted: Tue Sep 01, 2009 12:31 pm    Post subject: Need urgen help. Fuel pump problem Reply with quote

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 !!
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Flying Duck
PsyKotic Waterfowl


Joined: 27 Jan 2005
Posts: 9789
Location: Bumf***, WA

PostPosted: Tue Sep 01, 2009 12:36 pm    Post subject: Reply with quote

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)
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K1100 Rocketship
Big Brick Rider


Joined: 25 Feb 2006
Posts: 54
Location: Devizes Wilts UK

PostPosted: Wed Sep 02, 2009 1:12 am    Post subject: Fuel pump problems Reply with quote

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.
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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 !!
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Rafal
Flying Brick Rider


Joined: 05 Jan 2009
Posts: 257
Location: Wroclaw, Poland

PostPosted: Wed Sep 02, 2009 1:50 am    Post subject: Re: Fuel pump problems Reply with quote

K1100 Rocketship wrote:
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 ?


Hello!
You can replace pump relay with other next to it - they are the same. Also carefully check the condition of power connector at right front area of underside of fuel tank - it is crucial.

Best regards
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Rafal
K1100RS is a real beast (in Marrakesh Red)
K75S is a real beauty - she has gone Sad, but not to far Smile.

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Flying Duck
PsyKotic Waterfowl


Joined: 27 Jan 2005
Posts: 9789
Location: Bumf***, WA

PostPosted: Wed Sep 02, 2009 8:06 am    Post subject: Reply with quote

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
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K1100 Rocketship
Big Brick Rider


Joined: 25 Feb 2006
Posts: 54
Location: Devizes Wilts UK

PostPosted: Wed Sep 02, 2009 3:39 pm    Post subject: Reply with quote

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 Smile
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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 !!
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Flying Duck
PsyKotic Waterfowl


Joined: 27 Jan 2005
Posts: 9789
Location: Bumf***, WA

PostPosted: Wed Sep 02, 2009 4:46 pm    Post subject: Reply with quote

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
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RJTrucker
Flying Brick Rider


Joined: 31 Mar 2008
Posts: 234
Location: Central NJ

PostPosted: Thu Sep 03, 2009 11:24 am    Post subject: Connector location Reply with quote

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
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Tim (Midland Section)
Flying Brick Rider


Joined: 08 Apr 2005
Posts: 959
Location: Cotgrave, Nottingham, England.

PostPosted: Thu Sep 03, 2009 6:37 pm    Post subject: Reply with quote

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
1998 K1100LTSE only 70,000 miles ATM
1996 Triumph Trophy 1200 (Sold)
1972 750 Commando
1967 BSA B40
G6HRN
#485
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hfxrzw
Mad Brick Rider


Joined: 30 Jan 2009
Posts: 78

PostPosted: Sat Sep 05, 2009 7:19 am    Post subject: Reply with quote

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
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