Trouble diagnosing problem

I sold a Duster to young ish mechanic buddy years ago. I drove it to work 60 mi one way every day before he bought it. No problem with me. The Duster did the same thing to him as the P here talks of, he replaced the gas tank 3 times (WHY!!!!) only to find a a dead bug in the long fuel line ( the front to rear one). The bug would get to a curve in the line and stop and plug it all up!!! Go figure!!