sorry but i cant buy your explaination. I will send you pics of my mehrans cng tank which will match the condition of a brandnew cng tank. My guess is that you do not manage your trunk properly , things keep hitting the tank which cause scratches. I could be wrong. Can you explain how cng damages the engine.
my comment will sound rude to many , for which i beg your pardon in advance , just didnt seem like a logical debate..