I have never heard that before. But okay I'll state there is an extremely remote possibility...maybe. :noidea: However, the only way a metal gas tank could even possibly start a fire via a spark, is if there were gas spilled out side the fuel system for any spark to catch a fire. Other wise I can't see any possibility. But then you do have static electricity with plastics as well. So not sure swapping from metal to plastic would be a great reason. Again :noidea: But I will take your word as well. JMHO