BMW K bikes (Bricks)

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1Back to top Go down   Fuel leak Empty Fuel leak Mon May 02, 2016 8:59 pm

ckahleer

ckahleer
active member
active member
I acquired this 96 K1100RS a little over a month ago and it sat in the garage for about 3 weeks with 1/4 tank of gas with no leaking. About a week ago I filled it to about 7/8 full. It is now leaking fuel from somewhere under the gas tank. There is gas on the top of the black plastic box just under the rear of the tank. (see pic).
Does anyone have an idea on what is likely to cause this leak?
Thanks,
Craig
Fuel leak Gas10

    

2Back to top Go down   Fuel leak Empty Re: Fuel leak Mon May 02, 2016 9:45 pm

RicK G

RicK G
admin
admin
Check out for bubbles in the paint work they are a give away for a small area of corrosion or the big O-ringwhich is under the plate that holds the wiring as it enters the tank. The insulation under the tank may be soaked with fuel and need to be dried.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

3Back to top Go down   Fuel leak Empty Re: Fuel leak Sun May 15, 2016 10:50 am

ckahleer

ckahleer
active member
active member
Thanks Rick,
It was the the big 0-ring. All is good now.

    

4Back to top Go down   Fuel leak Empty Source of leak found Mon Jun 06, 2016 3:31 am

Ian_J

Ian_J
New member
New member
Maybe mine isn't as simple as a leaky "O"-Ring!

Having stripped off the "temporary" patch applied by a previous owner I now understand why it was struggling to contain the leak, and which took it off the road 8 years ago!




Fuel leak <a href=Fuel leak 27422508681_e9d20afd43_kDSC_0016 by Ian Johnson , on Flickr" />

[img]Fuel leak 27217402850_c147a4f956_k DSC_0018 by Ian Johnson , on Flickr[/img]

    

5Back to top Go down   Fuel leak Empty Re: Fuel leak Mon Jun 06, 2016 10:33 am

RicK G

RicK G
admin
admin
That is about the biggest corrosion hole I have seen in a K tank. Congratulations Ian you appear to be the winner. Laughing 
It is a bit beyond a simple patch and should be fixed by cutting the corroded area out and welding a new piece in and not over the hole as that will promote more corrosion.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

6Back to top Go down   Fuel leak Empty Re: Fuel leak Mon Jun 06, 2016 12:33 pm

brickrider2

brickrider2
Life time member
Life time member
Reports such as these are a puzzle to me.  The interior of my 1985 vintage tank appears absolutely new.  There is no hint of corrosion anywhere inside, and it isn't lined with anything that I can detect.  After so many years in service, it's odd it appears new. Why do some tanks fail?  Is that inevitable?  I know aluminum is subject to oxidization when left to the elements (I'm thinking of a radio mast now), but I thought keeping aluminum covered with fuel would prevent corrosion.  Question: is it better to have the tank topped off with fuel or empty in storage?

    

7Back to top Go down   Fuel leak Empty Re: Fuel leak Mon Jun 06, 2016 12:46 pm

Dai

Dai
Life time member
Life time member
I empty mine and remove any filler caps and petrol (gas) taps. Steel tanks then get a slosh round with engine oil to coat the insides and get stored up in the roof of the garage over the oil burner where it's (usually) warm and dry.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

kennybob

kennybob
Silver member
Silver member
i've got a k75s tank with two holes in the bottom left side at the lowest point where water-fuel (10% ethanol) will collect when the tank is on the side stand.  The tank had been painted with a thick coat of a heavy flex agent paint. 

There was a slight drop of fuel sitting on this strange bubble under the tank edge--which promptly emptied the tank when i probed the bubble to see what it was.  The water had eroded a perfect circle in the tank about the size of a pencil, and the paint was the only thing holding the fuel in.  Just lucky it didn't open up on the road.  Now i go out of my way (and pay more)  to find and only buy pure gas.

i doubt they are using 200 proof alcohol to add to the gas so there is already a water content to begin with, but alcohol absorbs water from the warm moist air and the water collects in the bottom of fuel tanks and does it's destruction.

    

9Back to top Go down   Fuel leak Empty Re: Fuel leak Mon Jun 06, 2016 5:16 pm

indian036

indian036
Life time member
Life time member
@kennybob wrote:i doubt they are using 200 proof alcohol to add to the gas so there is already a water content to begin with, but alcohol absorbs water from the warm moist air and the water collects in the bottom of fuel tanks and does it's destruction.
While the gummint is trying to make us use 10% ethanol fuel in NSW (to support their ethanol producing $$ donors), we at least have some ethanol free fuel.
I won't use ethanol fuel even in a lawnmower, let alone my boat or bikes! 

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original
    

10Back to top Go down   Fuel leak Empty Re: Fuel leak Mon Jun 06, 2016 8:37 pm

RicK G

RicK G
admin
admin
Any water in the fuel tank will be absorbed by the alcohol and will pass harmlessly through the system, it is when water is left to sit in the lowest part of the tank that the electrolitic action takes place and makes holes in the aluminium.
If I ever get into the situation of having to use low octane fuel like 91 (and I have had to do it a few times) in Australia or 85 in USA then I use fuel with ethanol because 91 alone will cause detonation which is harmful to the Nicasil bore where 91 with ethanol will cause much less detonation, I just make sure to run a couple of full tanks of 98 afterwards to remove the ethanol which will cause long term damage to the rubber components.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

11Back to top Go down   Fuel leak Empty Re: Fuel leak Tue Jun 07, 2016 12:39 pm

brickrider2

brickrider2
Life time member
Life time member
"...91 alone will cause detonation which is harmful to the Nicasil bore where 91 with ethanol will cause much less detonation...."


I'm always happy to find 91 octane on rides.  It's often the case that 89 RON is the only available fuel in the more remote areas of Idaho. (Sometimes it's only 85 :-()  I'm not aware of detonation on my 1985 K100RS, but I do routinely wear ear plugs when I ride.  Now you have me wondering if I'm destroying the engine with my fuel choices.
If the numerical designation of the fuel indicates it's resistance to detonation, why would the presence of alcohol matter?  Won't 91 RON be 91 RON whether it is "pure gas" or mixed with alcohol?

    

12Back to top Go down   Fuel leak Empty Re: Fuel leak Tue Jun 07, 2016 8:12 pm

RicK G

RicK G
admin
admin
There have been many posts on this difference over the years and AFAIK 91 in Australia is the same fuel as 85 in USA and probably all of NA.
Alcohol will not detonate anywhere near as much as Petrol (gas) so even 10% ethanol will prevent the detonation that low octane fuel causes.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

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