What does the fuel line look like from Volvo 850

Hello guys Well, I don’t know exactly where to start. So, I’m driving a 850, built-in 95. Last week I was fitted a new engine. It looked clearly different from the one that was in it before. Among other things, there was a pump fixed, but it was not connected with a hose or cable. So far so good. Sunday I drove a distance of 500km everything good, except that it consumed about 3l of oil. Monday I then have a little bit of the diagnostic plugs (the, the The gas smell came from a thin, white tubing made of hard plastic that ran between the connections of the spark plugs and the lid of the engine block. Well, he had an open end, and far and wide no connection where I could put it. The shawl was not really fixed anywhere. Well, gasoline smell, so I rang the garage, They came around with a trailer and we wanted to drive him out of the driveway about 3m and then the last 3m on the trailer. Well, I only came the first 3m…..then the engine was in flames. I got out of the car, bonnet up and with the little fire extinguisher in, well, that was nonsense, so garden hose from the neighbor. Luckily I had reactivated the previous day. After felt 5 minutes the fire was out. It was really a full fire, But I think I just hope up to the front wall. The engine and all plastic as well as bonnet, scrap. 🙁 Well, that my beloved old well leased Volvo is probably scrap :-(…but my question. It looks like the distributor cap exploded, which definitely hasn’t melted, I was faster with the water. How can petrol come in there? and.. what was this thin hard plastic hose? Was that the fuel line? I’m not a mechanic, I drive and care only, I always let the rest be done by the workshop, this time unfortunately by a freeman:-( So, yes, the fire department was also there, police and Gaffer. And another question: clearly there is a black spot on the road, not greasy but just a fire spot. In the evening I got a short message from a friend of the fire department, he said I had to report this spot to the community, otherwise I would be responsible if an accident happened here. Is that true? I mean the police and the feu They were there, too.