BMW K bikes (Bricks)

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1Back to top Go down    Fuel pump not priming on Fri Sep 15, 2017 6:50 pm

audibob

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Hi all,

my k100 fuel pump does not prime when the ignition is switched on.

Any ideas anyone ?

Pump output is good and she pulls all the way to the redline.

Bob


__________________________________________________
Yamaha 90
Honda CD 175
Honda CB 360
Triumph T 140V Bonneville
Triumph T150 Trident
Honda CB750 F1
Cz 175
Yamaha XS 750
R 100/7
R 80
K100 LT
K100 LT current bike
    

2Back to top Go down    Re: Fuel pump not priming on Fri Sep 15, 2017 7:03 pm

Inge K.

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audibob wrote:my k100 fuel pump does not prime when the ignition is switched on.

That's normal on a Jetronic equipped model......the fuel pump starts when
you hit the start button.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

3Back to top Go down    fuel pump not priming on Fri Sep 15, 2017 7:35 pm

audibob

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Thanks for the info Inge.

I assumed the pump should prime when the key is turned.

Bob


__________________________________________________
Yamaha 90
Honda CD 175
Honda CB 360
Triumph T 140V Bonneville
Triumph T150 Trident
Honda CB750 F1
Cz 175
Yamaha XS 750
R 100/7
R 80
K100 LT
K100 LT current bike
    

4Back to top Go down    Re: Fuel pump not priming on Fri Sep 15, 2017 8:18 pm

duck

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It only pumps when the engine is turning. The 4 valve Ks do prime the pump for a few seconds when the ignition is turned on though.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

5Back to top Go down    Fuel pump not priming on Sat Sep 16, 2017 9:10 am

audibob

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The reason for this post was during my recent 1100 TB swap I checked the fuel pressure .

With the gauge in place I switched the ignition on and before I hit the starter button, I heard the pump run and it primed the system .

That surprised me to say the least as I have never heard it prime before or since .

If my pump is not supposed to prime, how did this happen ?

Comical answers will be expected and duly accepted

Bob


__________________________________________________
Yamaha 90
Honda CD 175
Honda CB 360
Triumph T 140V Bonneville
Triumph T150 Trident
Honda CB750 F1
Cz 175
Yamaha XS 750
R 100/7
R 80
K100 LT
K100 LT current bike
    

6Back to top Go down    Re: Fuel pump not priming on Sat Sep 16, 2017 9:22 am

indian036

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Obviously the 1100 TBs gave it ideas above its station before it woke up to itself.

(Ask and Ye shall receive.).Razz

Bill


__________________________________________________
1985 K100RT Red. VIN 0028991K100RT ENG 104EA248523386
1985 K100RT Blue. VIN 0029036K100RT ENG 104EA25852071
1990 K100LT Black. VIN WB105060310190452
1984 K100RT White. VIN. 0023022K100RT ENG 104EA32848523
    

7Back to top Go down    fuel pump not priming on Sat Sep 16, 2017 10:18 am

audibob

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Silver member
Thanks Bill..

You could be right ...

But I know what I heard... affraid

Bob


__________________________________________________
Yamaha 90
Honda CD 175
Honda CB 360
Triumph T 140V Bonneville
Triumph T150 Trident
Honda CB750 F1
Cz 175
Yamaha XS 750
R 100/7
R 80
K100 LT
K100 LT current bike
    

8Back to top Go down    Re: Fuel pump not priming on Sat Sep 16, 2017 1:57 pm

robmack

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Life time member
Is the harness original, without any "owner modifications"? Anything is possible if modifications have been performed on the wiring.


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

9Back to top Go down    fuel pump not priming on Sat Sep 16, 2017 6:33 pm

audibob

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Silver member
Hi Robmack,

The only modifications to the wiring I saw was bullet type crimped connectors to the ignition switch cable at the

rear of the tank instead of the normal multi block type.

Not sure why that was done.

Apart from that the loom looked okay.

Bob


__________________________________________________
Yamaha 90
Honda CD 175
Honda CB 360
Triumph T 140V Bonneville
Triumph T150 Trident
Honda CB750 F1
Cz 175
Yamaha XS 750
R 100/7
R 80
K100 LT
K100 LT current bike
    

10Back to top Go down    Re: Fuel pump not priming on Sun Sep 17, 2017 2:25 am

uhoh7

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active member
active member
Sry to piggyback, but I have a similar thing.

I removed the tank on my two week old 1985 K100RS. I was changing coolant and dealing with weird wiring. I also was starting to clean a bit around and under the throttle bodies. The caps on the bodies were bad or missing, so I replaced them. I bypassed the BMU. I attempted but did not succeed with pin 7 on the flasher unit, but I went around it to get the non-working side blinking.

Put all back together. Power switch, lights, turn signals all work.

When I hit the starter, I hear the fuel pump, but engine does not turn over.

Did I dislodge a wire under the bodies, or something?

TY all Smile

    

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