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I have no personal experience of injection bikes, but here's a train of thought ....
Assuming that the electric fuel pump runs at a constant speed, ie it delivers a constant volume flow rate irrespective of engine revs, then a slow trundle back from the garage at relatively low revs would use little fuel and result in a high rate of fuel return to the tank.
If there is a one way "air in" vent (breather) and if there is also a pressure relief vent which is malfunctioning, then pressure would build up in the tank irrespective of any heating effects .. would it not ?
I think Capo posted a little feature on how the fuel cap vents work (on his injection, S4R), but that was some years ago .. and the pics are probably lost down the photobucket hole.
I'd bet he still has the info on file though.
Sorry for the hijack .... though we've been pretty good so far on such an (excellent) extended thread.
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