1 fuel in tank over heating Mon Sep 07, 2015 12:47 am
rawdonball
Gold member
A have a German Mate riding an F800GS (??) - clockwise from Perth around Oz. I think he has till Christmas. He started having problems when he got as far North as Mount Magnet - he says he thinks it is the fuel pump and it sounds like it might be heat related.
This prompts me to ask a question I've had in mind for yonks - why is the fuel heating worse on some bikes than on others?
A BMW guru South of Brisbane told me the early K100 introduced in Oz experienced these problems regularly and OME cured it by fitting up-rated fuel pumps....
The logic isn't clear to me - why would circulating more fuel increase the heat loss more than the heat pick-up?
Unless the change to pump volume delivery was linked to return fuel being discharged into the air space in the tank as opposed to being via the old type non return valve which is under liquid most of the time?? I can imagine that this might then have resulted in the non wetted (upper) part of the tank being able to contribute more to hear loss...
Any interest out there as regards batting this one around a bit?
This prompts me to ask a question I've had in mind for yonks - why is the fuel heating worse on some bikes than on others?
A BMW guru South of Brisbane told me the early K100 introduced in Oz experienced these problems regularly and OME cured it by fitting up-rated fuel pumps....
The logic isn't clear to me - why would circulating more fuel increase the heat loss more than the heat pick-up?
Unless the change to pump volume delivery was linked to return fuel being discharged into the air space in the tank as opposed to being via the old type non return valve which is under liquid most of the time?? I can imagine that this might then have resulted in the non wetted (upper) part of the tank being able to contribute more to hear loss...
Any interest out there as regards batting this one around a bit?
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'88 K100RT, '86 K75C, '05 Yamaha TTR250