Bernd,
The 2 small plastic lines on the bottom of the exp tank run into a small hole in the rear of the trunk (left side). You can feed them through to the 2 connections points on the gas tank by removing the 2 access plates on the inside of the trunk rear. Mine connect to the gas tank using 2 small sections of rubber gas hose, along with small hose clamps.
In terms of the other lines, you should have 2 holes in your trunk floor close to the exp tank (towards the front of the car). The rear most hole, hole closest to the body is where the long plastic line runs through the floor and out towards the front of the car. This connects into the engine. The font most hole, hole towards the inside of the trunk floor vents to atmosphere using a special rubber grommet.
Pics will help. Maybe John L. or others have some pics if this?
Good luck,
Bob