Question about 1996 BMW R 100 R

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Stop flowing so now i got the bike running again i have a problem with the fuel flow. it'll do good for about 20 mins of riding or so, and then the fuel will stop flowing thru the lines. i can see it stop thru my inilne filter. so i took the tank off and cleaned it out. check the petcock, it's good and flows good. so now my only guess is a stuck float but i just went thru the carbs and check the float valve and the housing and it all looked good with lil to no ridges on the rubber points. anything else that could be causing it to stop flowing.

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You'll have to check a manual for the location of the tank vent. Many have a vent in the cap, but not all of them do. A clogged vent will prevent fuel from flowing out of the tank after it's been running normally for 10-20 min. The fact that you see the fuel flow stopping in the line/filter, pretty much rules out the carb floats, doesn't it? The problem has to be in the tank, petcock or fuel line. You mentioned that you have another tube going into the petcock. That would indicate that you have a vacuum operated petcock. If the vacuum line is leaking, it could restrict fuel flow. Also if the vacuum diaphram inside the petcock is damaged, same deal. Just about all vacuum petcocks have a position labeled "prime". You can bypass the vacuum function by using this setting. Next time the fuel stops flowing, put the petcock in the "prime" position. If you see the fuel start to flow, then your problem is likely in the vacuum line or the diaphram.

Posted on Nov 20, 2008


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Your gas tank petcock is diaphram operated.
there is a vacuum line coming off the intake, that goes straightb to the petcock.
when you turn the motor over a vacuum is created, pulling the petcock diaphram back and allowing fuel to flow to your carburetor. when you turn the motor off the vaumm is gone and the spring behind the diaphram pushes it closed and stops the fuel flow to the carbs.

Now the reason the carbs are overflowing is because the floats valves are not closing, in other words the floats are sticking.
Usually a good carb clean will cure the problem, especially for that year.
the older ones usually require new float valves/seats that are usually found in a good carb rebuild kit. You shouldn't need one.

If your really broke try tapping on the bowls of the carburetor lightly, while the engine is running, sometimes the vibration will vibrate a particle loose that may be holding open the float valve.
if it works then the fuel should stop overflowing while running.

if you know how to work on it, try this, with the engine off.
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get a container to catch the gasoline.
while fuel is flowing tap the carb bowls a few times then closed the drain screws.
clean up any spilled gasoline .
start your bike.see if they stop leaking and the floats are closing.
if it still leaks, you'll need the cleaning.

Happy Riding
Best Regards
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