BMW K bikes (Bricks)


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CommanderKewl

CommanderKewl
Silver member
Silver member
OK my pump was kaput.  Bench tested bad.
Replaced pump with aftermarket pump that was approved in some other post.  Bought. Check.
Checked connection from connector upstream, voltage good but at 11.57v.
Pump will not work.  
OK connection coming from harness is good,  but voltage in not there at the fuel sender connection wires to pump.
Leads me to believe the problem is at the termination fuel block going thru tank. Maybe even at that ground lug on the outside.
question, there is corrosion at that point.  Can I just tack weld that with a GTAW torch?  Come to think of it, this might be the best way forward..
otherwise...

If this is the problem, my guess is another fuel sender unit.  8/85 is the build date.

I have another k100 but the connector is another style and the wires are already short as well as the tank connector is a little odd into the tank bulkhead.

I am to surmise that getting this will end my problems.

I've been following many other posts on start issues and have determined that I am getting pulses, water connection is good, relays are working.  Just nothing to get my pump excited to wish me a start situation.

Am I going down the correct path?
Really want this flexit sidecar going.

Thanks everyone.

    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
First off, 11.57 is a totally dead battery.  Anything done with it will not provide reliable data for troubleshooting.  You need to get it charged ASAP and if it won't hold a charge get it replaced.  There is nothing really worthwhile you can do before that.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

92KK 84WW Olaf

avatar
Life time member
Life time member
Just to clarify the 08/85 tank, has it got the connector on the front left? This is the early type of tank.

The other tank has the connector at the rear on the right?

On the older type those connectors give trouble. I had mine do that and no power was getting through to the fuel pump. You can open out the ends of the male pins a little with a precision screwdriver to make sure they make a tight fit in the connector on the tank. Refitting the plug should be a tighter fit.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

92KK 84WW Olaf

avatar
Life time member
Life time member
As Point-Seven-Five says, sort battery charge or battery first. Nothing can be relied on with a dud battery.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

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