BMW K bikes (Bricks)

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1Back to top Go down   Fuel Pump Issues Empty Fuel Pump Issues Wed Nov 17, 2021 8:36 pm

yamaguzzi

yamaguzzi
Life time member
Life time member
On my K100RS all the stuff in the tank had turned to a rusted mess after sitting for 15 years with gas in the tank.This is how I found the bike.So,in 2017 I replaced everything in there and got it back in service.It had 12,000 miles on it at that point.A short 3 years and 10,000 miles later the new fuel pump started blowing it's fuse.I nursed it to home with a 10 A fuse but if I hit the gas hard that would blow too.Took it all apart and found the new pumps damper fell apart from the ethanol in the gas here in the US. I figured bits of it were being sucked into the pump causing it to draw more electricity to operate due to increased internal friction .So,I got 10,000 miles and 3 years out of a new pump because of crappy rubber that is used to make this part. What I plan on doing is finding a material that will do the job and last so I can make my own damper . I don't want to be doing this job every 3 years at the high cost of parts that we have to pay for crappy rubber that fails after 3 years and wrecks an expensive fuel pump.I'm thinking neoprene fuel hose like what large pipe connections are made of .


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

2Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Wed Nov 17, 2021 10:06 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Do you store with E10 fuel in the tank? 

My first brick, a '94 K75RT, still has the pump and damper I bought it with.  That was 7 years and about 45,000 miles ago.  When it's going to be idle for more than a month I fill the tank with non-ethanol fuel and a shot of StaBil.  So far, the inside of the tank and the stuff in there still looks like it came from the factory.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Thu Nov 18, 2021 1:07 am

Laitch

Laitch
Life time member
Life time member
I've owned my Brick for nine years or so. It came to me with a clean tank interior and a Mahle fuel filter dated 1996; the pump holder and damper were intact. I changed the fuel filter. I've used nothing but 89 octane E10 in it since then; those components are still clean. In each November, I put it up for six-months with a full tank of E10 laced with Sta-Bil and its fully-charged battery disconnected. It has always started easily and run well in spring. The fuel hasn't separated and nothing has gummed up. I ride it for 6,000 to 10,000 miles a year.


__________________________________________________
1995 K75 81,000 miles
Fuel Pump Issues Usa-lo10
    

4Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Thu Nov 18, 2021 8:47 am

yamaguzzi

yamaguzzi
Life time member
Life time member
We can't get non ethanol fuel here in the NY metro area.It is not sold. The tank was like new after I cleaned it with acid and then washed it out a few times so the ethanol is to blame.We have had this garbage gas for 20 years now you'd think someone would be selling a damper made of something that doesn't fall apart when exposed to this crap. This is how clean I made the inside of the tank before putting in all new parts.Fuel Pump Issues Img_2410
When I removed the replacement pump after 3 years the rubber was falling apart and bits of it were floating around in the fuel.


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

5Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Thu Nov 18, 2021 10:16 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Pure-gas.org lists these guys as having non-ethanol gas in Huntington as of October 31, 2021.

HuntingtonSUNOCOAutomotive Technology631-923-1675116 Spring Road

If I couldn't source non-ethanol, I would drain the tank before storage.  An empty tank does not have enough thermal mass to generate significant condensation.  Just run the engine with some Stabil to protect the fuel remaining in the lines, rail and injectors.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

6Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Thu Nov 18, 2021 10:46 am

yamaguzzi

yamaguzzi
Life time member
Life time member
They list it but the greedy sob wants over 10 dollars a gallon so it really isn't an option.


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

7Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Thu Nov 18, 2021 10:51 am

yamaguzzi

yamaguzzi
Life time member
Life time member
@Point-Seven-five wrote:Pure-gas.org lists these guys as having non-ethanol gas in Huntington as of October 31, 2021.

HuntingtonSUNOCOAutomotive Technology631-923-1675116 Spring Road

If I couldn't source non-ethanol, I would drain the tank before storage.  An empty tank does not have enough thermal mass to generate significant condensation.  Just run the engine with some Stabil to protect the fuel remaining in the lines, rail and injectors.


I don't store my bikes.I have 6 on the road all insured ,registered ,and inspected and use them all year round .They are never off the road for more than a couple weeks at a time.We don't have the kind of winter you have upstate .Most of the time it's in the 40's with some 50's and when it's cold and snowy it only sticks around for a week to 10 days .


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

8Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Thu Nov 18, 2021 1:11 pm

Laitch

Laitch
Life time member
Life time member
@yamaguzzi wrote:The tank was like new after I cleaned it with acid and then washed it out a few times so the ethanol is to blame. 
I don't store my bikes.
It's difficult to understand why your experience with E10 would differ so much from mine.

One reason could be the sources of the fuel you're using. Another could be mileage combined with idleness. Suppose the total riding mileage of all your motos per year is 15000 miles. Divided among six motos that would be 2500 miles per moto. The length of idle time for Brick if it's the sixth moto in the riding cycle to be used could generate condensation in the tank. Bacteria could then go to work. A third cause could be the quality of replacement pumps and dampers.

Other than those, the cause could just be destiny.  Smile  I can understand your frustration. There seems to be a flaw in the durability of a Brick's pump mounting system, I just haven't encountered it. Maybe the rubber and composite parts in my moto's fuel tank were molded on a Wednesday.  Laughing


__________________________________________________
1995 K75 81,000 miles
Fuel Pump Issues Usa-lo10
    

9Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Thu Nov 18, 2021 1:40 pm

yamaguzzi

yamaguzzi
Life time member
Life time member
I put most of my mileage on the Moto Guzzi and the BMW with an even split.The 4 two strokes get limited use of about 800 to a thousand miles each due to the high cost of the synthetic 2 stroke injector oil I use in them and the fact that I have restored them to like new condition and want to keep them in that condition because of their value.So,the K100 gets around 4000 a year with a long trip up to Northern NY once a year and same for the MG 850-T .I run them both often . So,I guess it's wait and see time to see how long the rubber lasts of the aftermarket pump I bought from Euromotoelectrics . Maybe it was a bad batch of dampers or something like that but now I'm 6 months and around 3500 miles into the 2nd new pump so time will tell.


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

10Back to top Go down   Fuel Pump Issues Empty Fuel pump problem Fri Nov 19, 2021 7:18 pm

daveyson

daveyson
Life time member
Life time member
I'm thinking it's a bad rubber damper. I got cheap generic Chinese hydraulic hoses once, didn't even last two years. You would think the filter would stop the sticky rubber getting in the pump. 

Maybe the pump got rusty inside. When the warm air in the tank cools down condensation forms on the inner tank walls. Many short rides would make the problem worse. It's worse at a certain time of year too, here anyway. Keeping the tank full goes a long way to helping.

Service station tanks can crack and leak too, if you always get fuel from the same service station, that could be something to consider too. I knew a boilermaker who's full time job was repairing service station tanks. You could test the service station fuel and remove most of the ethanol at the same time too. Pour 10 litres into a clear container and check if any water settles to the bottom. Pour a litre of water in, shake it and relieve the pressure a few times. Allow it to settle. The ethanol is absorbed by the water, which reveals how much ethanol was blended in, you might only have say 9 litres of petrol left (and what looks like 2 litres of water) With a tap at the bottom you could drain the water out.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

11Back to top Go down   Fuel Pump Issues Empty Damper Wed Nov 24, 2021 12:09 am

Kafflut

Kafflut
Silver member
Silver member
I made my own damper using polyurethane. Works fine .. 4 years and counting

http://bmwk100k75.weebly.com/
    

12Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Wed Nov 24, 2021 2:20 am

Shep

Shep
Platinum member
Platinum member
Do you mind elaborating on that for some of us?
Thanks


__________________________________________________
Model        Production Date/Serial Number
K100RS      1984 July/ (F0040448)
K100RS      1986 Dec/ (H0142581)
    

13Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Wed Nov 24, 2021 11:45 am

Kafflut

Kafflut
Silver member
Silver member
@Shep wrote:Do you mind elaborating on that for some of us?
Thanks
Sure. I actually made an adapter in order to fit a smaller diameter generic fuel pump ... a fraction of the price btw

https://bmwk100k75.weebly.com/fuel-pump.html

Let me know if you can't access the link

http://bmwk100k75.weebly.com/
    

14Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Wed Nov 24, 2021 12:44 pm

brickrider2

brickrider2
Life time member
Life time member
Nice work.  Thanks for posting that.


__________________________________________________
1996 K1100LT
    

15Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Wed Nov 24, 2021 1:44 pm

Shep

Shep
Platinum member
Platinum member
Thank you for the detailed information.


__________________________________________________
Model        Production Date/Serial Number
K100RS      1984 July/ (F0040448)
K100RS      1986 Dec/ (H0142581)
    

16Back to top Go down   Fuel Pump Issues Empty Re: Fuel Pump Issues Thu Nov 25, 2021 6:29 pm

yamaguzzi

yamaguzzi
Life time member
Life time member
@Kafflut wrote:
@Shep wrote:Do you mind elaborating on that for some of us?
Thanks
Sure. I actually made an adapter in order to fit a smaller diameter generic fuel pump ... a fraction of the price btw

https://bmwk100k75.weebly.com/fuel-pump.html

Let me know if you can't access the link
Thanks , this is exactly the kind of information I am looking for.I love that you used the outer casing from the original fuel pump so it all fits right and you could use the screen on the bottom.I think that foam would help when the damper falls apart from the ethanol too as it will help filter the particles.


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

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