Question about 1996 BMW R 100 R
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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Posted on Jan 02, 2017
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