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K100-forum.com » Technical, repair and troubleshooting » Electrical » Brand new Fuel pump not working

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1Back to top Go down   Brand new Fuel pump not working Empty Brand new Fuel pump not working Tue Jan 08, 2019 2:49 am

JDiggamus

JDiggamus
active member
active member
Hello All,  Need some help here, I'm a novice.  I just bought a 1984 K100rs, the fuel pump was bad, at least so I was told, so I bought a new one and replaced it. However, nothing happens to the pump when I try turning the bike over.  Disclaimer, I haven't turned the bike on yet since I got it 5 days ago, been waiting on the fuel pump.  I haven't really checked anything other than the fuses and there are 2 fuses missing from the slots.  Anyone know what kind of fuses I need? 

If its not a fuse problem what could it be?

thanks for your help in advance, I'm learning as I go.

    

2Back to top Go down   Brand new Fuel pump not working Empty Re: Brand new Fuel pump not working Tue Jan 08, 2019 3:07 am

MartinW

MartinW
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Life time member
Fuel pump fuse is # 6 from the top marked Kraffstoppe. The 4 pin connector that resides under the RH side of the fuel tank is a known source of problems. Cleaning with 2 part DeoxIT can sometimes restore connectivity. Once mine started to play up I cleaned it a couple of times then replaced it. I replaced it with a waterproof one from an electronics store. With the connector apart check for power when you hit the starter button.
Regards Martin.


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1992 K75s
    

3Back to top Go down   Brand new Fuel pump not working Empty Re: Brand new Fuel pump not working Tue Jan 08, 2019 7:29 am

Dai

Dai
Life time member
Life time member
Also: fuse #4 has a 12-volt feed on one side but isn't connected to anything.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

4Back to top Go down   Brand new Fuel pump not working Empty Re: Brand new Fuel pump not working Tue Jan 08, 2019 7:43 am

92KK 84WW Olaf

avatar
Life time member
Life time member
On 84 K the fuel pump plug connector is the front left of the tank and is even worse for trouble.

If you probe into the pins on the plug you can open them out a little to make a better connection with the receiver under the tank.


__________________________________________________
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 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

5Back to top Go down   Brand new Fuel pump not working Empty Re: Brand new Fuel pump not working Tue Jan 08, 2019 9:22 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
I'm curious how you have an '84 K in the US. Is it a Euro model, or perhaps a build date of late 1984 which might make it an '85? The US didnt get K bikes until model year '85. Please post the last seven digits of the VIN as your signature so we know that we are looking at apples not tangerines.

Go to:
http://www.realoem.com - enter the BMW catalogue, then your VIN to see the model year, production date and intended market.


__________________________________________________
"How many cars did we pass today?" "ALL of them."
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

6Back to top Go down   Brand new Fuel pump not working Empty Re: Brand new Fuel pump not working Tue Jan 08, 2019 10:46 am

Laitch

Laitch
Life time member
Life time member
Please supply photos when describing problems. It is a help to respondents. Which fuses are missing?
Brand new Fuel pump not working K100_f10


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1995 K75 90,000 miles
    

7Back to top Go down   Brand new Fuel pump not working Empty Re: Brand new Fuel pump not working Tue Jan 08, 2019 10:53 am

duck

duck
Life time member
Life time member
First order of business is to make sure that the fuel pump is good.  Put 12V to the smaller diameter terminal and ground to the other terminal.


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

8Back to top Go down   Brand new Fuel pump not working Empty Re: Brand new Fuel pump not working Wed Jan 09, 2019 2:34 am

JDiggamus

JDiggamus
active member
active member
Two Wheels Better wrote:I'm curious how you have an '84 K in the US. Is it a Euro model, or perhaps a build date of late 1984 which might make it an '85? The US didnt get K bikes until model year '85. Please post the last seven digits of the VIN as your signature so we know that we are looking at apples not tangerines.

Go to:
http://www.realoem.com - enter the BMW catalogue, then your VIN to see the model year, production date and intended market.
Model K100rs 
Production mo/yr- 08/1984  
the intended market was Europe.

I got this beauty in Long Beach, CA

    

9Back to top Go down   Brand new Fuel pump not working Empty Problem Solved! Wed Jan 09, 2019 2:39 am

JDiggamus

JDiggamus
active member
active member
Thanks for all the advice people, in the end, it was the 4 pin connector that was faulty.  I also replaced all the fuses for good measure. The fuel pump is running.  thanks again!

    

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