Hi.
I just had the opposite problem so did some research and pulled my cap apart.
The breather will go both ways as it has two valves but they are small and can only deal with soo much preasure.
The suggestion in your first post is probably the correct one. If the bladder inside the injector pump fails preasure/air from the turbo can go to the tank via the fuel return line as it is diesel that is lubricating the pump. This would also explain the bubbling fuel; I think heated air from the turbo could have that effect on diesel fuel.
Is this problem related to speed only or could it be RPM/load related? You could try plugging the turbo to pump line and see if that eliminates the preasure build up in the tank. With out that line though I would expect your mixture to be lean at higher RPM so watch out for overheating. Someone please correct me if what I'm saying is too dangerous.
IMOA take it to someone who really knows their stuff. Playing with a really good hair dryer and diesel fuel can't be overly safe.
Good Luck.
Mike
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