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K100-forum.com » Technical, repair and troubleshooting » Electrical » Welded gastank and now the pump won't start

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Carlsen

Carlsen
active member
active member
Hi.
Had the pinhole leak beside the pump.
Sent the tank to a welder, didn't take anything off. Wire and pump still in.
Also changed the filter when I had washed the tank.
Now a few months later, it won't start.
Can the electricity from the weld f****ed it up?
I tried to start it with gas lid open and didn't see or hear anything. Got 12v to the connector. 
Didn't fill the New filter with petrol, didn't need to? If the pump had worked it would fill the filter?
Going to clean up and grease the ground point under the tank tonight, hope it would be that easy 😅

    

Laitch

Laitch
Life time member
Life time member
If the pump was functioning, fuel would have been pumped into the fuel filter. If it doesn't function after cleaning ground points and checking its terminals for correct and tight connections, remove the pump then test it with 12V on the workbench.


__________________________________________________
1995 K75 90,000 miles
    

gorio

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Silver member
Silver member
If all else fails remove the pump, remove the filter, spray the pump end of things full of penetrating oil, tap it against your palm firmly several times. the apply 12v on the bench.
Repeat as needed.
Once your happy it is working properly rinse with gas and re-install.
Remember the pump normal uses the gas for cooling so only run it in short bursts.

The idea being sometimes when left dry the pump gums up a bit and lacks enough torque the start. With a little help you can get them freed up.


__________________________________________________
1992 K100rs 16v
1997 R1100rt
2006 R1200rt
Past lives
Kawasaki Concours
1976 BMW R90s
1975 Ducati 860gt
1992 Honda VFR750
1985 Honda VF750
1982 Kawasaki 750GPZ
1975 Norton 850 Commando
    

Carlsen

Carlsen
active member
active member
Grounds didnt help, but was about time.
Sucked fuel threw the pump and filter, nothing.
Took 12v directly to the fuse and the pump made a knuckle, every time I tried the same thing. So seized?
Will take it out tomorrow and try the oil thing.
Note to self, do things fast even when it's off season

    

92KK 84WW Olaf

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Life time member
Life time member
I just ordered 2 pumps from Tills.de as spares. €29 each.


__________________________________________________
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
    

Carlsen

Carlsen
active member
active member
92KK 84WW Olaf wrote:I just ordered 2 pumps from Tills.de as spares. €29 each.
Didn't find it, just this unbranded one https://www.tills.de/fuel-pump-k75-k100-k1100-new-bosch-original-298.html
Says bosch original in the link 🤣

    

Laitch

Laitch
Life time member
Life time member
Carlsen wrote:Didn't find it, just this unbranded one . . .
Have you verified the diameter of your moto's fuel pump?


__________________________________________________
1995 K75 90,000 miles
    

Carlsen

Carlsen
active member
active member
Oh, so it's different sizes aswell 🥲

    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
BMW does not make part substitution easy. It's been said that BMW stands for Bikes Made Weird.


__________________________________________________
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
    

Carlsen

Carlsen
active member
active member
52mm, dont know if I broken the went line now, but it was about time for that one too. Damper a little gooie, f**k me.. cost as much as the pump 🤣

    

Carlsen

Carlsen
active member
active member
Victory! 😁😁😁 the pump was the problem

    

92KK 84WW Olaf

avatar
Life time member
Life time member
My spares arrived last Friday, so have 52 and 43mm pumps and spare filters. 

I have a leak repair job to do on the tank of my 84 K100 RT.


__________________________________________________
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
    

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K100-forum.com » Technical, repair and troubleshooting » Electrical » Welded gastank and now the pump won't start

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