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Fuel pump issue

 
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Fruitjuice



Joined: 19 Feb 2021
Posts: 4
Location: Belgium

PostPosted: Wed Mar 31, 2021 4:23 pm    Post subject: Fuel pump issue Reply with quote

BMW K1100, 1993.
Running fine last week and snapped the clutch cable. Made it home Without issues. Installled a new clutch cable and now the fuel pump no longer works. Pump itself is fine and pumps when 12v is applied out of the bike. Is there some sort of safety that prevents the pump from turning? What should I be measuring at the 4-pin connector outside of the tank? Side stand is in, fuses all ok. Clutch is not required for cranking....close to setting it on fire!
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“Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride! Hunter S. Thompson
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Scott_Anderson
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Joined: 05 Sep 2006
Posts: 3055
Location: Central Iowa, USA

PostPosted: Wed Mar 31, 2021 5:09 pm    Post subject: Reply with quote

Check/recheck the side stand switch. they can and do fail.
Also check your kill switch on the handlebar, if you don't regularly cycle the switch it can cause issues.
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1995 K1100LT 0302044
1997 R1100RT ZC62149
Garmin StreetPilot 2820
Garmin Zumo 550
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.)
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Grunter
Flying Brick Rider


Joined: 30 Sep 2015
Posts: 244
Location: North East England

PostPosted: Wed Mar 31, 2021 6:50 pm    Post subject: Fuel Pump Reply with quote

It may be that when you disturbed the tank to replace the clutch cable, this was enough to damage the power connection. Connecting the pump to an alternative power source will not show this fault.

The main suspect for me is the 4 pin connector. This connector is not very robust and the pins can detach from the sealed internal connecting wire. As you have had to move the tank and presumably disconnect the connector, almost certainly here lies your problem. If the other switches such as the one on the stand or kill switch were working before you started the work, those giving the problem is very unlikely

They are all the same on K75/K100 and K1100 bikes and on one of my K75's it failed just like this. The easiest way to rectify this was a 3rd party accessory 4 pin connector because the section of the plug not connected to the tank is part of the main wiring loom and cannot be replaced with a BMW item unless the whole loom is replaced. The plug is a sealed unit on both ends and cannot be repaired. The plug has to be cut off and replaced with the after-market connector. You may have to extend the wires on the lower part of the loom. I hope this helps.
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1986 K75c. Good mechanical order. Now resprayed BMW Avus Black (unlined) and looking good.


Last edited by Grunter on Thu Apr 01, 2021 5:48 am; edited 2 times in total
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Scott_Anderson
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Joined: 05 Sep 2006
Posts: 3055
Location: Central Iowa, USA

PostPosted: Thu Apr 01, 2021 5:38 am    Post subject: Re: Fuel pump issue Reply with quote

Fruitjuice wrote:
Clutch is not required for cranking....close to setting it on fire!


Not true, if the bike is not in neutral-- you will need the clutch switch working.
_________________
Ride safe.



1995 K1100LT 0302044
1997 R1100RT ZC62149
Garmin StreetPilot 2820
Garmin Zumo 550
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.)
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Fruitjuice



Joined: 19 Feb 2021
Posts: 4
Location: Belgium

PostPosted: Thu Apr 01, 2021 9:23 am    Post subject: Re: Fuel pump issue Reply with quote

Scott_Anderson wrote:
Fruitjuice wrote:
Clutch is not required for cranking....close to setting it on fire!


Not true, if the bike is not in neutral-- you will need the clutch switch working.


That's probably correct, never tried starting it while in gear.

In the mean time the problem got solved.
Issue was a combination of a bad side stand switch which I took out of the equation and a bad contact in the 4-pin connector to the tank.
_________________
“Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride! Hunter S. Thompson
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Acentistaha
Big Brick Rider


Joined: 28 Sep 2017
Posts: 51

PostPosted: Sun Apr 04, 2021 9:20 pm    Post subject: Reply with quote

This is a great thread. I'm having kind of the same problems so, thank you.
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Jim
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Joined: 17 May 2003
Posts: 3793
Location: WHERETHEFUNNEVERENDS

PostPosted: Sun Apr 04, 2021 9:54 pm    Post subject: ODYSSEY batteries Reply with quote

I think I hold the record for killing Odysseys - 4 in 3 years. Tried a couple different chargers the battery shop sold me - batteries died anyway.

Eventually found that NoCo chargers would keep the Odyssey batteries going...
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Jim
1997 K1100LTSE 94,000
1995 R100RT Classic 13,650 crashed!
1991 K75RTP 46,000 - almost done!
1992 R100R 24,000 - FOR SALE

"We shall not all die, but we shall all be changed."
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