BMW K bikes (Bricks)

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1Back to top Go down   Gas Tank Float Empty Gas Tank Float Wed Nov 16, 2022 12:45 am

jjefferies

jjefferies
Life time member
Life time member
Hi all,
really don't know where to post this. But my '90 K75 (Silver) fuel level float makes noise hitting the sides of the tank. I think this is what's happening as it is most obvious when the tank's been filled. The tank's filler flap is still present so I can't look in to see for sure. And this has not been an issue on my Red K75. So I'm asking if this is a common annoyance. I won't call it a problem as I don't think it is anything more than an annoyance and if that's just the way it is, I'll live with it. But if a simple adjustment somewhere would correct it I would try that the next time I have the tank open. At present the low fuel level light comes on at 135-145 miles, i.e. maybe 10 miles before I would prefer. My preference being to have it come on at 150 miles, meaning I have 50 or so miles of fuel left in the tank.

Thanks and best regards
J.Jefferies

    

2Back to top Go down   Gas Tank Float Empty Re: Gas Tank Float Wed Nov 16, 2022 1:29 am

duck

duck
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Life time member
Can you hear this when riding? If so then you should consider wearing earplugs when you ride. If you don't then you're risking damage to your hearing.

Robmack has a good write-up on adjusting the fuel level sender lighting up the low fuel lamp.

https://www.k100-forum.com/t9265-messing-with-the-in-tank-fuel-sender


__________________________________________________
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 (x2)
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
    

3Back to top Go down   Gas Tank Float Empty Re: Gas Tank Float Wed Nov 16, 2022 2:18 am

jjefferies

jjefferies
Life time member
Life time member
duck wrote:Can you hear this when riding? If so then you should consider wearing earplugs when you ride. If you don't then you're risking damage to your hearing.
Nah, just when starting or moving around prior to going. My ear plugs are effective enough to keep out most noises once I'm over 30 mph. But before that yes.

    

4Back to top Go down   Gas Tank Float Empty Re: Gas Tank Float Wed Nov 16, 2022 1:46 pm

robmack

robmack
Life time member
Life time member
Do you have a fuel level gauge and, if so, does it indicate the correct level?  If you don't have a gauge, then when you look into the tank is the level arm floating correctly?  I'm thinking that if the float ball itself is damaged, it might be filled with gasoline and sinks to the bottom of the tank. The way the float arm is formed makes it impossible to hit the side of the tank.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

5Back to top Go down   Gas Tank Float Empty Re: Gas Tank Float Wed Nov 16, 2022 2:53 pm

jjefferies

jjefferies
Life time member
Life time member
robmack wrote:Do you have a fuel level gauge and, if so, does it indicate the correct level?  If you don't have a gauge, then when you look into the tank is the level arm floating correctly?  I'm thinking that if the float ball itself is damaged, it might be filled with gasoline and sinks to the bottom of the tank.  The way the float arm is formed makes it impossible to hit the side of the tank.
No fuel level gauge, this bike has the simple fuel level low light. And while I've not taken the flapper valve out to check ,think the float is up high enough to be tapping on the top sides of the tank. Well, that's what it sounds like. When the fuel level is lower, say after 30 miles, the float isn't hitting the sides. As I mentioned before the sound can only be heard when the tank is full and the bike not moving fast. Mostly when coming off the center or side stand and when first starting off. While I doubt it, it is possible the float arm could have been bent. I was more suspecting the bottom end of the arm where it connects to the rheostat as being off.

    

6Back to top Go down   Gas Tank Float Empty Re: Gas Tank Float Wed Nov 16, 2022 9:12 pm

robmack

robmack
Life time member
Life time member
If you think that the float arm is banging up against the top of the tank, then you can adjust the mechanical stop on the sender to limit the upwards movement of the arm.  I would test your theory beforehand though..

Gas Tank Float Img_3910

The tab pointed to by the BLUE arrow in the picture is the upper mechanical limiter for the arm.  Remove the gas cap to provide more access, reach into the tank and carefully bend it towards the sender case.  Make small incremental adjustments instead of large bends.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

7Back to top Go down   Gas Tank Float Empty Re: Gas Tank Float Wed Nov 16, 2022 9:47 pm

jjefferies

jjefferies
Life time member
Life time member
thank you, will try that soon. Just now I've got the whole garage torn up trying to make space for all three bikes. As soon as that task is finished I'll try the adjust.

best regards
J.

    

8Back to top Go down   Gas Tank Float Empty Re: Gas Tank Float Wed Nov 16, 2022 11:03 pm

duck

duck
Life time member
Life time member
If it's boinking the tank when full then it probably isn't a flooded FLS ping pong ball.


__________________________________________________
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 (x2)
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
    

9Back to top Go down   Gas Tank Float Empty Fuel float Thu Nov 17, 2022 3:18 am

daveyson

daveyson
Life time member
Life time member
Another possibility, a fuel hose or the filter, might be vibrating close to, and banging against the tank wall, or a pipe.


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

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