Fuel Pump Runs With Key in Off Position - BMW Luxury Touring Community
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post #1 of 15 Old Jun 16th, 2015, 10:58 pm Thread Starter
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Red face Fuel Pump Runs With Key in Off Position

I changed the fuel filter on my 2002 LT and all seemed to go well. I reinstalled the tank and reconnected two QDs and electrical plug. When I connected the electrical connector I felt the pump kick on and stay on. Ignition switch was in off position and pump never built pressure and shut off, it just keeps running. Since pump was running I turned ignition switch on, hit start button and it would not fire, but pump sure does run. This bike is my daily driver and I most certainly induced this problem. Any advice would be appreciated.

Alan
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post #2 of 15 Old Jun 16th, 2015, 11:04 pm
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Re: Fuel Pump Runs With Key in Off Position

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Originally Posted by afastchief View Post
I changed the fuel filter on my 2002 LT and all seemed to go well. I reinstalled the tank and reconnected two QDs and electrical plug. When I connected the electrical connector I felt the pump kick on and stay on. Ignition switch was in off position and pump never built pressure and shut off, it just keeps running. Since pump was running I turned ignition switch on, hit start button and it would not fire, but pump sure does run. This bike is my daily driver and I most certainly induced this problem. Any advice would be appreciated.

Alan
There is a second plug with power on all the time, it will plug into pump connector and pump will run with key off, check for correct plug
Patric and Axle like this.

Gary
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post #3 of 15 Old Jun 16th, 2015, 11:11 pm
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Re: Fuel Pump Runs With Key in Off Position

yep thats it, 2nd power plug is same type and size

Regards Linton
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post #4 of 15 Old Jun 17th, 2015, 9:49 am Thread Starter
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Re: Fuel Pump Runs With Key in Off Position

Wow, my last LT was a 2001 model that I changed the filter on a couple times and never encountered this problem. I must say it makes my head hurt thinking about another plug that fits the f/p connector and isn't used for something? I will take a look this afternoon and see if I can find the correct connector...w/o having to pull the tank again. I hope that is the reason it would not crank as well. Thank-you for the information.
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post #5 of 15 Old Jun 17th, 2015, 10:15 am
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Re: Fuel Pump Runs With Key in Off Position

It might not crank because the battery voltage dropped below the relay cutoff voltage.
12.1v I think.

Doug B.
2000 LT purchased July 2013
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post #6 of 15 Old Jun 17th, 2015, 11:34 am
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Re: Fuel Pump Runs With Key in Off Position

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It might not crank because the battery voltage dropped below the relay cutoff voltage.
12.1v I think.
Unless it has been retrofitted with the newer relay system the '02 models didn't have the voltage sensing relay.

The second connector that is the same as the fuel pump connector is to add a plug to the right side. Just like the one on the left side it is hot all the time.
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post #7 of 15 Old Jun 17th, 2015, 12:03 pm
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Re: Fuel Pump Runs With Key in Off Position

I thought the relay was changed in '01. My mistake.

Doug B.
2000 LT purchased July 2013
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post #8 of 15 Old Jun 17th, 2015, 12:52 pm
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Re: Fuel Pump Runs With Key in Off Position

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I thought the relay was changed in '01. My mistake.
You are partly correct, but with BMW the production changes can be confusing. In many cases when a change affects production of 2001 models (Europe), the USA gets the same design only in 2002.

In August 2001, BMW-USA has published a Service-Bulletin about the retrofit part number and the procedure to install this new starter relay - Bulletin 12 001 01 (023).

In this Service-Bulletin it states that production changes had already happened in January 2001 for the K1200RS (because of new revised fairing design and IABS intro). However for the K1200LT only a starting VIN is included for the change (no exact date).

So for those with a K1200LT who would like to check their VIN the text is (as quoted):
"The new starter relay will be introduced into series production as follows:
K 1200 RS: with introduction of K 1200 RS facelift model, 01/01
K 1200 LT: with series production starting with VIN ZD 77402"

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K1200RS (2002 IceBlue/Red - 96,000 miles)
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post #9 of 15 Old Jun 17th, 2015, 1:43 pm Thread Starter
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Re: Fuel Pump Runs With Key in Off Position

If the connectors are hot all the time what prevents this from draining the battery and causing undo wear to the pump?
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post #10 of 15 Old Jun 17th, 2015, 2:15 pm
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Re: Fuel Pump Runs With Key in Off Position

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If the connectors are hot all the time what prevents this from draining the battery and causing undo wear to the pump?
The one that is supposed to go to the fuel pump is not hot all the time. The ones that go to the power outlet plugs are.

The unfortunate thing is the wiring and connector are always there right next to the fuel pump connector even if you don't have the optional right side plug. For some reason it didn't occur to the BMW engineers that the two could be mixed up by using the same type of connector.
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post #11 of 15 Old Jun 17th, 2015, 2:59 pm
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Re: Fuel Pump Runs With Key in Off Position

If you had an accessory plug on the lower right side, this is where the "hot" all the time wire would plug into. Some people use the always hot accessory plug for a battery tender.

Mike Trevelino
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post #12 of 15 Old Jun 18th, 2015, 8:48 am Thread Starter
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Re: Fuel Pump Runs With Key in Off Position

Many thanks to all that helped me understand this unique electrical feature of the LT?? I found the other connector that I had pushed out of sight when reinstalling the tank. I swapped plugs and runs like a charm. We are heading to Niagara Falls in the morning and it will be nice riding the LT vs the HD. Thanks again to all who helped.

Alan
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post #13 of 15 Old Oct 18th, 2015, 9:46 pm
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Re: Fuel Pump Runs With Key in Off Position

Just did the same on a 2002; connected the "always on" power plug up to the fuel pump by mistake; after repeating all my steps--ie removing fuel tank and fuel pump assembly/putting all back together with same results--I then checked this forum and checked the plug; sure enough I then found the correct plug; all good now.
Ron
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post #14 of 15 Old Oct 19th, 2015, 7:29 pm
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Re: Fuel Pump Runs With Key in Off Position

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Originally Posted by gilchristron View Post
Just did the same on a 2002; connected the "always on" power plug up to the fuel pump by mistake; after repeating all my steps--ie removing fuel tank and fuel pump assembly/putting all back together with same results--I then checked this forum and checked the plug; sure enough I then found the correct plug; all good now.
Ron
You would not have gotten very far had you not corrected the issue as the "other" plug is wired reverse of the correct plug. This causes the pump to run all the time, but backwards. It will not build any fuel pressure.

John
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post #15 of 15 Old Oct 20th, 2015, 1:42 am
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Re: Fuel Pump Runs With Key in Off Position

I have a habit of putting a tape label on each of the plugs when undoing them, either with a number on each, or some description, that way I always know what goes where.... 1>1, 2>2 etc. Saves the headache later.... same goes for undoing bolts and parts and such.

Chris
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