Volvo V70 Bifuel Bj 98 goes out

Volvo V70 Bifuel Bj 98 goes out !!!!!!!!! Hello On the way to Italy we stopped in the middle of the highway. Left lane,three lane AHHHHHHHHHHHHHHHHHHH!!!!!!!!! Were driven with gas (Earth gas) Adac has taken us out,on the ADAC yard he starts again (Benzin) thought the gas had been switched off. Gas everything, journey with gasoline continued – driving about 200km make a break, he jumps no more.Was about 45 minutes jumps again after another 100 KM ‘s the same. Länfgerer Pause jumps back on ,under the highway and to the provisional destination place ,at the traffic lights full stress ,flatters and threatens to go out always in the empty run gas given? Can not someone? Do you have to know about it?